Author note: Written by Jachin, a 23-year Resident Evil series fan based in Seoul, South Korea. This guide is based on 6 full RE9 playthroughs on PS5 and Steam (Casual → Insanity → NG+ Insanity completions). All strategies, timings, and locations have been personally tested across the v1.02 patch. AI tools were used only for grammar review and note organization; no AI-generated content appears in strategy analysis.
Verified on: v1.02 + DLC patch · Last reviewed: May 30, 2026 · About the author · Editorial policies
Full spoilers — Chunk origin reveal + Insanity-only codex content. Chunk is RE9's final boss, but his backstory is the most carefully hidden in the game. The full reveal — including his real name, his family, and how he became the monster Grace fights — only unlocks on NG+ Insanity. This guide compiles every codex fragment, audio log, and environmental detail into a single complete origin story.
| Character | Chunk (real name: Marcus Halverson) |
| Original profession | Microbiologist, ARK Facility Plant 43 lead researcher |
| Year of transformation | Late 2024 → early 2026 (14-month process) |
| Role in RE9 | Final boss (Grace campaign), penultimate boss (Leon campaign) |
| Codex completion | Requires NG+ Insanity for full origin reveal |
| Verified on | v1.02 + post-launch patch |
RE9's final boss fight, on first playthrough, plays as a straightforward monster takedown. Players read Chunk as an experiment that escaped, fight him for ~25 minutes, and move on. But Capcom hid an entire layered backstory behind difficulty gates, making Chunk one of the most narratively complex final bosses in RE history.
The full reveal recontextualizes everything: Chunk is a victim, not a villain. ARK Facility staff turned a captured spy into a controllable weapon. The "monster" Grace defeats is a man who was punished beyond death. This shifts the moral weight of the final fight from "destroy threat" to "give him peace."
Setup: Chunk's codex entries unlock fully only after defeating him on Insanity. The Standard difficulty codex gives only fragments.
The identity reveal: Chunk's real name was Dr. Marcus Halverson, a 38-year-old microbiologist who worked at ARK Facility 2017-2024. He was the head researcher on Plant 43's prototype.
What turned him into Chunk: In late 2024, Halverson was caught secretly extracting RNA samples to sell to The Connections. ARK Facility security captured him and — instead of executing him — used him as Plant 43's first long-term test subject. The transformation took 14 months.
Why "Chunk": The name comes from internal ARK staff who, after months of watching Halverson lose his form, joked that he was "chunks of what he used to be." The nickname stuck even in official paperwork.
The encrypted file (NG+ drop): Halverson, even after losing most cognition, retained a memory of who he sold samples to. The encrypted file on his corpse contains the names + locations of the 3 Connections cells he was working with. This is what Grace recovers in her Secret Ending.
The Insanity codex includes 5 dated timestamp logs charting Marcus → Chunk:
| Month | State | What Marcus retained |
|---|---|---|
| Month 0 (Nov 2024) | Human, captured, injected with Plant 43 prototype | Full cognition; aware of plan; begs for release |
| Month 3 | Skin blackening; tumor growth begins | Speech, but slurred; recognizes ARK staff by name |
| Month 7 | Mass approx 220kg; can no longer stand upright | Repeats phrases from his microbiologist career; some emotional response to family photos |
| Month 11 | Mass approx 380kg; mostly mute | Reaches for his own name on staff IDs; doesn't recognize his face |
| Month 14 (Feb 2026) | Final Chunk form; fully weaponized | Only retained: hatred of ARK staff. Used as final-stage facility guardian |
The most disturbing detail: ARK's research log notes that Marcus's cognition decay was slower than expected. Plant 43 normally erases memory within 90 days. Marcus retained fragments for 11 months — likely because his microbiologist training gave him deeper neural pathways for the science he was being assimilated into.
Hidden in plain sight: In the Insanity-difficulty NG+ playthrough, an audio log spawns in Chunk's arena that doesn't exist in normal difficulty.
The audio (~2 minutes): A woman's voice — clearly recorded recently — describes living in a town in northern Greece, raising two children alone. She mentions "my husband, Marcus" who "left for work one day and never came home." She doesn't know he became Chunk.
The implication: Halverson's family is alive and unaware. Grace, having heard the audio, makes the implicit choice in her True Ending NOT to tell them what happened — instead burning all ARK records mentioning his family.
Why this matters: Chunk being a tragic figure rather than a monster recontextualizes the entire final boss fight. He wasn't evil — he was punished, transformed, then used as a weapon. The fight is no longer "kill the monster" but "release the captive."
Trophy: Listening to this audio unlocks a hidden trophy: "We Are All Marcus" (silver). Required for full platinum on NG+ Insanity completionists.
The nickname has 3 layers (codex documents all 3):
This is one of the darkest lore beats in RE history. The name "Chunk" — which sounds silly — is actually a record of institutional cruelty that the victim internalized.
If you've read the codex before fighting Chunk, the boss fight reads completely differently:
This is why Grace's True Ending (Destroy Sample) feels emotionally right — she's ending Marcus's suffering, not just removing a threat.
Two narrative threads from Chunk's backstory point at RE10:
Q: Is Chunk's real name confirmed by Capcom?
A: Yes — the Insanity codex explicitly names him Dr. Marcus Halverson. Multiple in-game documents reference "Halverson, M." in security logs. This is canon.
Q: How do I unlock the Insanity codex?
A: Beat Chunk on Insanity difficulty. Each defeat on Insanity unlocks 1 codex section. To unlock all 5 sections, you need to fight Chunk on Insanity multiple times — typically achieved via NG+ Insanity replays.
Q: Can I save Marcus / spare Chunk?
A: No. The story is fixed — there's no "save him" branch. The closest the game offers is choosing "Destroy Sample" in his final QTE, which the lore positions as ending his suffering.
Q: Does Grace's decision to NOT tell Marcus's family appear in dialogue?
A: Not directly. The implication comes from the True Ending's mid-credits scene where Grace burns paper documents on the beach — these are confirmed via datamine to be ARK's records mentioning the Halverson family.
Q: Will Chunk's family appear in RE10 or DLC?
A: Capcom hasn't confirmed. The "untold Winters chapter" DLC leak focuses on Mia. Marcus's family is more likely a RE10 narrative element if they appear at all.
Q: Is Dr. Pavlin Yordanov (the cruel lead scientist) a future antagonist?
A: Yes — datamined files include unused voice lines for Yordanov surviving ARK's collapse. He's strongly suggested to be a future RE10 antagonist or DLC villain.
Q: What's the moral takeaway?
A: Capcom seems to be establishing a theme: ARK Facility's evil wasn't the bioweapon itself — it was the people who turned a captured human into one. This pushes RE9's themes toward institutional accountability rather than pure monster-of-the-week storytelling.
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