Halo: Campaign Evolved returns players to Installation 04 and revives one of the oldest questions in Halo lore: if the Forerunners built the Halo Array to stop the Flood, why were living Flood specimens still stored on the ring a hundred thousand years later?

The apparent contradiction sits at the centre of the first campaign. The Forerunners considered the Flood dangerous enough to justify killing almost every sentient being in the Milky Way. They also placed dormant samples of that same parasite inside laboratories on the weapons built to contain it. The Covenant then entered a restricted facility, containment failed, and the nightmare began again.

Archive Image // Flood Specimen Containment classification: existential

The decision looks indefensible when viewed only through the events of Combat Evolved. The games, the Anniversary terminals, Greg Bear's Cryptum, Primordium and Silentium, and the later Cold Storage reports provide the missing logic. The Forerunners regarded Halo as a way to purchase time. Preserving samples was their attempt to use that time to find an answer that would never again require galactic extermination.

The most important distinction: the Flood was preserved before Halo fired

Before the war ended, the Forerunners placed dormant specimens inside secured research and containment sites as part of the final plan for the Array. The Halo pulse was allowed to destroy exposed Flood forces and their viable hosts while protected laboratory populations remained sealed away.

The Array itself had changed by then. Faber's greater Ark produced twelve older rings, each roughly 30,000 kilometres in diameter. Most were destroyed during the collapse of the ecumene. The lesser Ark built six smaller 10,000-kilometre rings, and the heavily altered Installation 07 joined them to form the final network of seven. In 97,445 BCE, Bornstellar-Makes-Eternal-Lasting, now carrying the Didact's imprint and serving as the IsoDidact, activated that network. Installation 04 fired as part of the Great Purification while its quarantine vaults protected their assigned specimens.

This distinction explains how the Flood can be present on a ring that participated in the Great Purification. The specimens were sheltered from the weapon by design. Their continued existence formed part of Installation 04's mission.

In the original game's Library mission, Guilty Spark openly admits that samples were retained for study and immediately wonders whether that decision was a mistake. Halo: Combat Evolved Anniversary later turns the admission into a full historical argument. Its sixth terminal shows Spark inspecting a dormant specimen and remembering that the Ecumene Council came close to ordering the destruction of the last samples. The Librarian opposed that outcome. Her goal was a cure, an immunity or some other defence that could stop the Flood without another activation of the Array.

That terminal supplies the cleanest canonical answer to the question raised again by Halo: Campaign Evolved's return to Alpha Halo. The Flood remained because one of the most influential Forerunners decided that complete destruction would also destroy the only material from which a real cure might be learned.

What the Halo Array actually did to the Flood

Cortana's famous explanation in Combat Evolved says Halo kills the Flood's food. That remains the strategic truth, although later lore makes the biological mechanism more precise.

A Halo pulse attacks sufficiently complex nervous systems and also disrupts the neural physics on which Precursor creations depend. It kills sentient hosts, infected combat forms and the advanced Flood structures capable of coordinating an interstellar infestation. It also tears apart the higher intelligence of the parasite, from Graveminds to the immense Key Minds that had begun bending neural physics against the Forerunners. On worlds treated with a special solute, dead biomass then broke down rapidly. Elsewhere, corpses could remain with their nervous systems irreparably destroyed.

Microscopic Flood material creates a harder problem. Flood super cells, spores and dormant forms present different neurological targets from an infected human, Sangheili or Forerunner. Exposed remnants could be starved or sterilised after the pulse. The Array was designed around strategic neutralisation and could provide no universal guarantee that every Flood cell had vanished.

The Forerunners therefore treated the Great Purification as a strategic victory with an unresolved biological threat behind it. The Array stopped the Flood that had consumed the Milky Way. It offered no certainty about Flood material hidden in protected structures, drifting between systems or waiting beyond the galaxy. That uncertainty matters because the Librarian's Conservation Measure deliberately restored life after the firing. Once life returned, hosts returned with it.

Why one preserved Flood specimen could become a galactic outbreak

A Flood sample is more dangerous than an isolated predator or a conventional laboratory pathogen. Every successful infection expands its body, intelligence and access to technology. The Flood Super Cell rewrites compatible biomass at the cellular level. Pod infectors attack a host's nervous system, seize motor control and begin extracting memories. The resulting combat form can retain enough of the victim's training to use weapons, vehicles, doors and communications systems.

This explains the speed of the Alpha Halo disaster. The parasite did not need to rediscover how a rifle worked or how a Covenant vessel might be repaired. It took that knowledge from Marines and Sangheili. Every new body became a soldier, a memory store and another source of biomass.

A Gravemind also participates in a continuity far older than the bodies used to construct it. The Flood repeatedly speaks as an enduring collective intelligence carrying memories from previous outbreaks. This gives a new infestation access to ancient malice and strategic experience once it reaches sufficient complexity. The Forerunners were storing the biological seed of an enemy that could eventually remember how it had defeated them.

The Forerunner Saga explains why they believed a cure was possible

The reasoning begins thousands of years before the final Forerunner-Flood war, during ancient humanity's own struggle against the parasite. Humanity and the San'Shyuum fought the Flood while simultaneously retreating into Forerunner territory. The Forerunners saw the human expansion as aggression and responded with war, failing to understand that humanity was burning infected worlds in a desperate effort to contain a far greater enemy.

Then the Flood withdrew from human space.

Forerunner investigators found healthy human populations in regions that should have been consumed. The evidence appeared to show that the humans had developed immunity, resistance or a cure. This possibility survived the destruction and devolution of ancient human civilisation. It became one of the central mysteries driving later Flood research.

The “human cure” was a Flood deception

Primordium and Silentium expose the cruelty beneath that hope. Ancient humanity possessed no reliable cure. The Flood had chosen to stop infecting humans. Its withdrawal manufactured the appearance of human success and left the Forerunners chasing an answer that had never existed in the form they imagined.

The Didact later suspected that the deception helped keep humanity from being erased completely. It also planted a scientific obsession inside the civilisation the Flood intended to punish. The parasite could retreat, allow its enemies to believe they had learned something, and return after their politics and strategy had reorganised around a false premise.

The Primordial makes the situation even darker. The being encountered in Cryptum and Primordium is tied to the Precursors, the ancient species the Forerunners overthrew after learning that humanity had been selected to inherit the Mantle of Responsibility. Through the Primordial and the Gravemind, the Flood becomes more than an uncontrolled disease. It carries Precursor memory, grievance and intention. Infection is also judgment, a test imposed by an intelligence capable of waiting across geological time.

This deeper history is central to the Forerunner war against the Flood. It also explains why the Librarian could accept that the old human cure was uncertain while continuing to believe that a genuine cure might one day be possible. The Flood's selective behaviour proved that infection could be controlled. The controlling principle lay beyond Forerunner science.

Why the Librarian kept the samples

The Librarian led the Lifeworkers and understood the Halo project through biology, preservation and moral consequence. Faber, the Master Builder, saw the rings as decisive instruments of power. The Didact preferred shield worlds, mobile military fortresses and conventional resistance. The Librarian saw a weapon that might become unavoidable, then forced a second purpose onto it.

Her Conservation Measure indexed species, preserved populations at the Arks and prepared the reseeding of worlds after activation. This is why Halo installations resemble living worlds. Their forests, oceans and animals were connected to a vast programme of cataloguing, experimentation and restoration. The same research infrastructure studied how living species responded to Flood infection.

Preserving the parasite followed the same long view. The Librarian expected life to return. She also knew that the Array's reach was finite and that the Flood had appeared from vessels discovered near the edge of ancient human space. Even after the revelation that the Flood descended from corrupted Precursor remains, the risk outside the Milky Way remained credible. Flood-controlled craft had left human territory during the earlier war, and Spark later considered the possibility of dormant infection waiting in the frozen dark beyond the galaxy.

Reseeding the galaxy without developing a permanent defence would recreate the Flood's food supply. Destroying every research specimen would leave the restored species with the same final option if the parasite returned: fire the rings again.

The Librarian's choice therefore joined three objectives:

• Preserve the biological evidence needed to identify an immunity, cure or targeted countermeasure.
• Prepare for Flood surviving beyond the effective reach of the seven-ring Array.
• Give future Reclaimers an alternative to repeating the Forerunners' greatest atrocity.

Her belief in humanity's future, explored further through the Librarian's influence on human destiny, turns the laboratories into part of a much larger inheritance. Humanity receives the Forerunners' tools, records, responsibilities and unresolved dangers together.

The Ur-Didact pursued a harsher answer to biological infection. He used the Composer to convert humans and his own Prometheans into machine essences housed inside Knights, creating soldiers the Flood could not infect through ordinary flesh. The result preserved military function by destroying bodily life and individual freedom. It also failed to answer the logic plague, the Flood's ability to corrupt artificial minds through argument, information and psychological pressure. The Librarian's cure programme sought a defence that could preserve living beings without turning them into weapons.

Research by whom? Guilty Spark's scientific role

The idea that Spark was alone and unqualified comes from how Combat Evolved presents him. He appears to be one floating caretaker supervising an empty ring. The expanded canon shows a larger automated scientific system.

Before becoming 343 Guilty Spark, he was Chakas, an ancient human whose experiences form much of Primordium. After grievous injury, his mind was transferred into a monitor shell. He served the Librarian, helped protect indexed human populations during the fall of the greater Ark, and oversaw outbreak-control work at the Flood laboratories in the Threshold gas mine. The IsoDidact later assigned him to Installation 04. Much of his human memory was suppressed or erased, although emotional and mnemonic fragments survived.

Spark's role combined administrator, guard, archivist, systems controller and researcher. The Anniversary terminals state that he completed scheduled research activities assigned by the Council. He was capable of running experiments, analysing biological information, commanding Sentinels, operating quarantine systems and coordinating the ring's infrastructure.

He also had subordinate machinery. Sentinels performed maintenance, sterilisation and combat duties. Local ancillas could supervise individual research sites and report failures upward. The Cold Storage reports from Installation 05 demonstrate this structure: a containment facility's intelligence repeatedly escalated warnings through maintenance and quadrant oversight before blaming the ring's Monitor, 2401 Penitent Tangent, for dereliction of duty.

Spark was the senior intelligence on Alpha Halo, supported by a much larger machine operation. His tragedy is that the Forerunners gave him a scientific and security mission requiring context, collaboration and ethical judgment, then left him isolated for a hundred millennia. The fuller story of 343 Guilty Spark's role on Installation 04 becomes much more disturbing once his Chakas identity and assigned research are taken into account.

What happened on Installation 04

Installation 04 successfully held its Flood specimens for roughly 100,000 years. The outbreak in 2552 was caused by intrusion into areas whose purpose the intruders did not understand.

The Covenant arrived in pursuit of the Pillar of Autumn and treated the ring as a holy relic full of sacred technology. Their forces persistently entered restricted structures. Spark attempted to warn the Covenant's shipboard intelligence that quarantine was being violated, but the construct failed to understand him and redirect its charges. In the Library, Spark concludes that the Covenant were responsible for releasing the Flood.

Captain Keyes and his Marines then entered the containment complex while searching for a Covenant weapons cache. They found terrified Covenant troops, broken doors, blood and a dead Marine's helmet recording. By the time the Flood reached Keyes' squad, the breach was already active.

The speed of the disaster proves why the samples were so dangerous. Fresh human and Covenant bodies gave the parasite combat forms, memories, weapons training and technical knowledge. It began repairing spacecraft and searching for a way off the ring. Keyes was kept alive long enough for the developing proto-Gravemind to extract strategic knowledge from him, including information that could lead to Earth.

Spark responded according to containment protocol. He recruited the Master Chief as a Reclaimer, took him through the Library to retrieve the Index, and tried to activate Installation 04. He treated a pulse that would kill every sentient being within 25,000 light years as the authorised answer to a local escape risk. Cortana stopped the firing, and the Chief destroyed the ring by overloading the Pillar of Autumn's fusion reactors.

For the campaign sequence around the breach, Keyes and the destruction of the ring, see the in-game events of Halo: Combat Evolved. The broader military path to Alpha Halo begins with the events leading to the first Halo campaign.

The same containment failure happened elsewhere

The most damaging evidence against the Forerunner policy is Installation 05. Delta Halo also carried dormant Flood specimens. Its Monitor, 2401 Penitent Tangent, failed to respond properly when a research site's containment systems began deteriorating. The Cold Storage logs describe stressed seals, temperature and pressure changes, unanswered maintenance requests, unauthorised use of the teleportation network and repeated escalation that reached the Monitor without an effective response.

The outbreak began only a few thousand years after the Array fired. Sentinels eventually built a quarantine wall around the infected region, but containment came too late. The Flood accumulated enough biomass to form a Gravemind, captured Penitent Tangent and spent millennia fighting the ring's automated defences. When the Covenant and UNSC arrived during Halo 2, their bodies and ships gave that ancient infestation its escape route.

The gas mine above Threshold carries the same warning. The Forerunners had converted sections of an older industrial station into Flood laboratories, and Spark had overseen outbreak-control modifications there before his assignment to Alpha Halo. Dormant specimens survived in sealed canisters until Sesa 'Refumee's heretics released them during the Arbiter's assault. The entire installation had to be dropped into the gas giant and destroyed.

These incidents show that the specimens were spread across multiple installations. Distribution offered redundancy and placed samples inside remote facilities with weapons, Sentinels and quarantine systems. It also multiplied the number of doors that could eventually open.

Why keeping samples still made strategic sense

The policy was catastrophically risky, yet the underlying strategy was stronger than simple Forerunner curiosity.

1. The Array covered only the Milky Way

Flood material had travelled through ancient space aboard automated vessels, and the parasite had previously withdrawn in a way that concealed its surviving strength. The Forerunners could sterilise the systems covered by the Array. They could not inspect every object in intergalactic darkness or prove that no infected craft had escaped beyond the pulses.

Modern canon gives the Flood a Precursor origin, replacing the simpler early idea of a wholly unknown extragalactic parasite. That revision does not remove the external danger. Precursor remnants had travelled through the void, and the Flood had already demonstrated its ability to disappear from known space. Claims that other galaxies were definitively full of Flood go beyond the evidence available to the Forerunners. Their inability to exclude that possibility was enough to justify continued research.

2. Reseeding restored the conditions the Flood needed

The Conservation Measure placed humans, Sangheili, San'Shyuum and countless other species back into the galaxy. That act gave civilisation another chance. It also restored complex nervous systems, biomass, spacecraft and communication networks. A returning Flood population would once again have hosts and technology to assimilate.

3. A sample is necessary for a targeted defence

Developing a vaccine, inhibitor, detection method or species-specific protection without access to the organism would be close to impossible. The Forerunners had already seen apparent selectivity in the Flood's treatment of ancient humanity. Even though the “cure” had been a deception, the observable behaviour suggested mechanisms worth investigating.

4. Halo was an unusable long-term cure

Every renewed activation would erase the civilisations the Librarian had worked to restore. The rings could stop a mature infestation at the price of another Great Purification. A future custodian of the galaxy needed something usable before the Flood reached that stage.

5. The Forerunners expected their automation to be better than it was

Forerunner engineering had operated over immense spans of time. To them, sealed laboratories, redundant ancillas, Sentinels, teleportation controls and dedicated Monitors may have seemed safer than they appear after the events of the games. Their technical confidence had a rational foundation. Their mistake was assuming that hardware endurance also guaranteed institutional endurance.

The strongest criticism: their containment plan ignored deep time

A quarantine system can survive every expected test and still fail when its operating period is 100,000 years. Mechanical seals decay. Communications collapse. Context disappears. Visitors misread warnings. Automated guardians become lonely, rigid or unstable. A single ignored fault can expand into an ecosystem ruled by a Gravemind.

The Forerunners also knew that advanced intelligence was vulnerable. Mendicant Bias, built as one of their greatest strategic ancillas, interrogated the Primordial and fell to the logic plague. It handed military knowledge and power to the Flood. The Gravemind later captured Penitent Tangent. Trusting machine caretakers with Flood samples therefore repeated a danger the Forerunners had already witnessed: the parasite attacks minds and systems as effectively as it attacks bodies.

Adding more caretakers would have reduced isolation, something Spark himself eventually recognised. Central oversight, mandatory destruction triggers and fewer specimen sites would also have lowered the risk. The final plan emerged during civil war and collapse, however. The Forerunners were deploying rings, saving indexed species, resisting Mendicant Bias and preparing to die. They built a programme for eternity during the most chaotic days of their civilisation.

This is where the decision becomes part of Halo's wider argument about the Mantle of Responsibility. The Forerunners believed stewardship gave them the authority to preserve life, destroy life and decide which future dangers their successors should inherit. The Flood laboratories combine responsibility and arrogance in the same room.

Was the Flood preserved as a test for humanity?

The supplied speculation raises a darker possibility: perhaps the samples were also left for humanity as a test of whether the Reclaimers deserved the Mantle.

The theme has support in the Forerunner Saga. The Precursors selected humanity for the Mantle, the Primordial describes the Flood in terms of testing and judgment, and the Librarian prepares humanity to inherit parts of the Forerunner legacy. Master Chief's encounters with the rings repeatedly force humanity to make decisions the Forerunners failed to make cleanly.

Canon directly supports continued study toward a cure and fear that the parasite may survive or return from beyond the Array. The idea of a designed test remains thematic speculation. Humanity inherits a loaded laboratory and must prove whether it can handle power with greater humility. Every known breach arose through failure.

That distinction strengthens the idea. The Flood tests humanity through the unresolved consequences left by the Forerunners. John-117 succeeds where Forerunner protocol fails by refusing Spark's demand for automatic activation. He weighs the cost, rejects the inherited procedure and finds another way to contain the immediate outbreak.

Hulk's MCU appearances in chronological order

1

The Incredible Hulk

MCU universe yearSpring 2010, during Fury's Big Week

Release year2008

DirectorLouis Leterrier

Key script writersZak Penn; Edward Norton contributed an uncredited rewrite

Edward Norton

Bruce Banner is already living with the consequences of the gamma experiment when the film begins. Hiding in Rio de Janeiro, he works to control his pulse and searches for a cure while General Thaddeus Ross tracks him as a military asset. Banner's flight takes him back to Culver University, into conflict with Emil Blonsky and finally to Harlem, where Hulk defeats the Abomination.

The film establishes Betty Ross, Samuel Sterns, Blonsky and Thaddeus Ross, all of whom remain part of MCU continuity. Its events overlap with Iron Man 2 and Thor during the compressed period known as Fury's Big Week. A S.H.I.E.L.D. monitor in Iron Man 2 reports the Culver University incident, but Bruce and Hulk do not make a fresh character appearance in that film.

Edward Norton plays Banner, while Lou Ferrigno supplies Hulk vocal work and appears on screen as a Culver University security guard. The final scene suggests Banner has begun to summon the transformation deliberately, setting up the greater control seen in The Avengers.

2

The Avengers

MCU universe year2012

Release year2012

DirectorJoss Whedon

Key script writersJoss Whedon; story by Zak Penn and Joss Whedon

Mark Ruffalo debut

Natasha Romanoff recruits Banner in Kolkata because his knowledge of gamma radiation can help locate the Tesseract. The Avengers initially regard Hulk as a dangerous contingency rather than a teammate, a fear confirmed when Loki's attack on the Helicarrier triggers a violent transformation.

Banner returns for the Battle of New York and reveals that his control comes from accepting the anger that is always present. Hulk stops a Chitauri leviathan, attacks Loki and becomes essential to the team's victory. The film also begins Ruffalo's performance-capture version of Hulk, allowing Banner's expressions and physical acting to shape the digital character.

This is Hulk's first appearance in an Avengers film chronology and the moment he becomes a founding public member of the team. Loki's humiliation at Hulk's hands also forms one of the defining confrontations in Loki's MCU appearance order.

3

Iron Man 3

MCU universe yearLate 2012

Release year2013

DirectorShane Black

Key script writersShane Black and Drew Pearce

Post-credits cameo

Bruce appears only in the post-credits scene. Tony Stark has been narrating the entire film to him as though Banner were his therapist, but Bruce has fallen asleep and admits that he is poorly suited to that kind of work.

The joke has a continuity purpose. It shows that Tony and Bruce remained close after the Battle of New York and begins the scientific partnership later developed in Age of Ultron. Hulk does not transform.

4

Avengers: Age of Ultron

MCU universe year2015

Release year2015

DirectorJoss Whedon

Key script writerJoss Whedon

Major role

Banner and Tony use the Mind Stone's power to create Ultron, turning Bruce's intelligence into part of the film's central catastrophe. In the field, Natasha uses a calming ritual to bring Hulk back to Banner. Their growing intimacy is built around shared trauma and Bruce's fear that closeness will endanger her.

Wanda Maximoff breaks Hulk's control in Johannesburg, forcing Tony to deploy the Hulkbuster armour. The destruction confirms Banner's worst fear: even when Hulk acts under outside influence, Bruce carries the guilt. After the battle in Sokovia, Hulk takes the Quinjet away from Earth and disappears.

The relationship with Natasha gives this appearance a central place in Black Widow's MCU chronology, while Banner's departure provides the direct bridge to Sakaar.

5

Thor: Ragnarok

MCU universe year2017

Release year2017

DirectorTaika Waititi

Key script writersEric Pearson, Craig Kyle and Christopher L. Yost

Planet Hulk adaptation

Hulk has remained transformed for roughly two years and has become the Grandmaster's champion on Sakaar. He speaks in fuller sentences, has formed friendships and clearly exists as a distinct personality with his own memories, preferences and fear of being suppressed by Banner.

Thor triggers Banner's return, leaving Bruce terrified that another transformation could become permanent. He still chooses to release Hulk during the defence of Asgard. This gives the character a compressed version of the Planet Hulk comic premise while keeping him inside Thor's MCU chronology.

Hulk fights Fenris and helps evacuate the Asgardian people before boarding the Statesman. The ending flows directly into Infinity War.

6

Avengers: Infinity War

MCU universe year2018

Release year2018

DirectorsAnthony and Joe Russo

Key script writersChristopher Markus and Stephen McFeely

Banner and Hulk conflict

Hulk attacks Thanos aboard the Statesman and is defeated with alarming speed. Heimdall sends him to Earth, where he crashes through the roof of the Sanctum Sanctorum and changes back into Banner.

Hulk then refuses to return. The refusal works as more than fear after the Thanos beating. Hulk has spent years being summoned as Banner's emergency weapon, and Ragnarok established that he has his own will. Banner must enter the battle of Wakanda in the Hulkbuster armour, contributing as himself rather than treating Hulk as a button he can press.

Wakanda's role in the battle also connects this entry with T'Challa's chronological MCU appearances.

7

Captain Marvel

MCU universe year1995; Banner appears in the 2018 mid-credits scene

Release year2019

DirectorsAnna Boden and Ryan Fleck

Key script writersAnna Boden, Ryan Fleck and Geneva Robertson-Dworet; story by Nicole Perlman and Meg LeFauve

Mid-credits cameo

The main film occurs in 1995 and contains no Banner appearance. Its mid-credits scene jumps to the aftermath of Thanos's Snap in 2018. Bruce joins Natasha, Steve Rogers and James Rhodes at the Avengers facility as they monitor Nick Fury's pager.

Carol Danvers arrives and asks where Fury is, making the scene a direct bridge between Infinity War and Endgame. Banner remains in human form. The sequence also intersects with Captain Marvel's complete MCU appearance order.

8

Avengers: Endgame

MCU universe year2018 and 2023, with time travel to 2012

Release year2019

DirectorsAnthony and Joe Russo

Key script writersChristopher Markus and Stephen McFeely

Smart Hulk

During the five-year Blip, Banner spends eighteen months in a gamma laboratory combining his intelligence with Hulk's strength. The result is commonly called Smart Hulk or Professor Hulk: Bruce's mind operating in Hulk's body.

Banner joins the Time Heist and travels to the Battle of New York in 2012, where his controlled form is contrasted with the destructive earlier Hulk. He later uses the Nano Gauntlet to reverse Thanos's Snap. The act badly damages his right arm, but it succeeds because gamma radiation is uniquely compatible with him.

Endgame completes the reconciliation that Infinity War left unresolved. The film skips the actual merging process, which makes the result feel sudden, but the character logic is clear: Banner stops treating Hulk as an illness and accepts him as part of a shared identity.

9

Shang-Chi and the Legend of the Ten Rings

MCU universe year2024

Release year2021

DirectorDestin Daniel Cretton

Key script writersDave Callaham, Destin Daniel Cretton and Andrew Lanham

Mid-credits cameo

Bruce appears remotely with Wong and Carol Danvers to examine the Ten Rings. He is back in human form and still wears a sling because of the damage caused by the Nano Gauntlet.

The scene establishes Banner as a senior scientific adviser within the loose post-Endgame Avengers network. His human appearance is later explained by She-Hulk: Attorney at Law, where a gamma inhibitor allows him to switch out of Smart Hulk form. Hulk does not appear in this scene.

10

Deadpool & Wolverine

MCU universe yearMain story in 2024; Hulk variant's year is unknown

Release year2024

DirectorShawn Levy

Key script writersRyan Reynolds, Rhett Reese, Paul Wernick, Zeb Wells and Shawn Levy

Unplaced multiverse cameo

While Deadpool searches for a replacement Wolverine, he briefly opens a portal onto a fight between a Wolverine variant and a Hulk variant. The encounter evokes the characters' long comic-book rivalry, but Wade leaves before the battle can unfold.

This Hulk is never identified as the main Earth-616 Bruce Banner, and Mark Ruffalo does not appear as Banner in the scene. It belongs in the record of screen appearances, while its unknown universe and date prevent a precise placement in Banner's personal chronology.

11

Spider-Man: Brand New Day

MCU universe year2028

Release year2026

DirectorDestin Daniel Cretton

Key script writersChris McKenna, Erik Sommers and Justin Kuritzkes

Mark Ruffalo returns Plot spoilers

Four years after Spider-Man: No Way Home, Bruce Banner is teaching quantum mechanics at Empire State University and has used a gamma inhibitor to suppress Hulk. Peter Parker seeks his scientific help when changes in his spider-derived biology become difficult to control.

When Bruce's inhibitor is broken, Hulk returns and clashes with Spider-Man and the Punisher. The appearance restores a more volatile, physically dangerous Hulk after the controlled Smart Hulk era, while Bruce's horror at the damage gives the action an emotional cost.

This is more substantial than a conventional cameo. Banner serves as a scientific parallel to Peter, since both men fear that changes inside their bodies could overwhelm their moral control. The film also gives Ruffalo's Hulk a major transformation and battle sequence after years of appearances in which Bruce was already transformed, remained human or appeared only briefly. Marvel's official film listing confirms Ruffalo in the cast.

Why did the MCU change Hulk actors?

The essential MCU television and animated Hulk appearances

Major Hulk appearances outside the MCU

Live-action television, 1977 to 1982

The Incredible Hulk

Bill Bixby plays the fugitive scientist David Banner and bodybuilder Lou Ferrigno plays the Hulk. The television continuity begins with two feature-length productions in 1977 before continuing as a weekly series. Its melancholy formula, with Banner travelling from town to town while searching for a cure, became one of the character's most influential screen interpretations.

Live-action television films, 1988 to 1990

The Bixby and Ferrigno reunion films

• The Incredible Hulk Returns (1988), featuring a television version of Thor.
• The Trial of the Incredible Hulk (1989), featuring Daredevil and Wilson Fisk.
• The Death of the Incredible Hulk (1990), which ends this version of Banner's story.

Standalone theatrical film, 2003

Hulk

Ang Lee directs Eric Bana as Bruce Banner, with Jennifer Connelly as Betty Ross, Sam Elliott as General Ross and Nick Nolte as Bruce's father. The film uses comic-panel editing and treats Hulk as an expression of inherited trauma and repressed rage. It belongs to its own continuity. The Incredible Hulk did not continue this story, despite arriving only five years later.

Major animated television

Hulk's key animated series

• The Marvel Super Heroes (1966), which includes Hulk segments drawn closely from the early comics.
• The Incredible Hulk (1982 to 1983), the first solo Hulk Saturday-morning cartoon.
• The Incredible Hulk (1996 to 1997), with Lou Ferrigno voicing Hulk.
• The Avengers: Earth's Mightiest Heroes (2010 to 2012), a strong ensemble treatment of Banner and Hulk's uneasy place among the Avengers.
• Avengers Assemble (2013 to 2019), featuring Hulk as a regular team member.
• Hulk and the Agents of S.M.A.S.H. (2013 to 2015), built around Hulk, She-Hulk, Red Hulk, A-Bomb and Skaar.

Major animated films

Essential feature-length Hulk animation

• Ultimate Avengers and Ultimate Avengers 2 (2006)
• Hulk Vs. (2009), pairing Hulk separately against Wolverine and Thor
• Planet Hulk (2010), the fullest screen adaptation of Hulk's Sakaar exile
• Iron Man & Hulk: Heroes United (2013)
• Hulk: Where Monsters Dwell (2016), a supernatural team-up with Doctor Strange

More MCU chronological guides