The God Valley Incident, Explained: What the One Piece Manga Actually Shows Before the Film
Full spoilers for One Piece through the Wano arc and recent manga chapters, including references to Imu, Rocks D. Xebec, and the ongoing Elbaf arc. If you're not caught up, stop here.
Toei's announcement of ONE PIECE FILM GOD VALLEY sent a lot of readers back to a piece of backstory the manga has spent years teasing without ever fully showing. The God Valley Incident is one of the most consequential events in One Piece history — it's where Gol D. Roger became a legend, where Monkey D. Garp earned his title, and where an entire pirate crew got erased from the record books. But the manga's own account of what actually happened there is fragmented, filtered through unreliable narrators, and — depending on which outlet you trust — still not fully resolved even in the most recent chapters.
Before the film arrives, it's worth separating what the manga has actually confirmed from what's still speculation, rumor, or narrator bias baked into the text itself. This is a rundown of that — including the places where the sources covering it don't fully agree with each other.
Where the God Valley Incident first shows up in the manga
The God Valley Incident wasn't introduced through a flashback or an action sequence — it was introduced through dialogue, and specifically through a character with every incentive to shape how it's remembered. According to both CBR and Beebom, the incident is first referenced in Chapter 957, during the Wano arc, when former Fleet Admiral Sengoku brings it up.
That detail matters more than it might seem at first. Sengoku isn't a neutral historian; he's a former top Marine official recounting events largely as the World Government would want them remembered. Beebom specifically notes that this Chapter 957 account "leans on the World Government's narrative," which is a meaningful caveat. It means the very first version of the God Valley story that readers got wasn't necessarily the full or accurate one — it was a filtered account, quite possibly shaped or softened by the same institution that later erased parts of the story from official record. Readers going into the film should keep that in mind: even now, there's no guarantee the "true" version of God Valley has been fully shown on the page.
What happened there, according to the manga's own account
Strip away the framing issues, and here's what the manga has actually established about the incident itself. Per CBR, the core event was a massive clash between the Rocks Pirates, led by the fearsome Rocks D. Xebec, and an alliance of Marines and the Roger Pirates. That alliance is notable on its own — the Marines and a pirate crew, however briefly, fighting on the same side against a common threat.
At the center of that alliance were Roger and Garp, who fought together against Rocks D. Xebec's crew. Beebom describes their partnership as "temporary," which lines up with everything else known about their relationship — Roger and Garp were adversaries for most of their careers, with Garp spending years chasing Roger down before his execution. God Valley is the exception: a moment where the two of them stood on the same side of a fight, and according to CBR's reporting, that partnership was central to actually defeating the Rocks Pirates.
The aftermath is where things get politically interesting. The World Government later erased Roger's role from the official history of the incident, crediting Garp alone as the "Hero of the Marines." That's a significant detail, because it means the story most of the world knows about God Valley isn't the full story — it's a version with Roger's contribution deliberately written out, likely because acknowledging that a Marine hero fought alongside a future Pirate King wasn't a narrative the World Government wanted circulating.
Who else was there
The battle wasn't limited to just Roger, Garp, and Rocks D. Xebec's crew. CBR confirms that Kaido, Whitebeard (Edward Newgate), and Big Mom (Charlotte Linlin) were also present and involved in the incident. That's three of the series' biggest antagonist-tier figures, all in the same place at the same time, decades before the current story — which goes a long way toward explaining why God Valley has been treated as such a monumental, character-dense event rather than a minor skirmish.
When did this actually happen?
The manga eventually pinned down a timeline for the incident. Beebom cites Chapter 1095 as the point where the manga confirmed God Valley took place 38 years before the current story's events. That gives readers a fixed point to work from — it places the incident firmly in the era when Roger and Garp were younger men, well before Roger's crew reached Laugh Tale and long before Garp settled into his role mentoring the next generation of Marines.
Where the on-page flashback actually starts — and why sources disagree
This is one area where the reporting genuinely splits, and it's worth presenting both sides rather than picking a winner. Gamerant's coverage frames Chapter 1156 as the chapter where "the God Valley Incident begins" on-page, placing the visual dramatization of the event within the currently airing Elbaf arc as of 2025. That's the more heavily cited claim, and it comes from a named outlet with a specific chapter attached to it.
There's also a separate, lower-confidence claim — sourced from an AI-search-summary rather than a directly verified outlet report — suggesting the flashback's chapter range runs closer to 1159-1166. That claim hasn't been independently verified the way Gamerant's has, and it should be treated with more caution as a result. The honest answer here is that outlets differ on the exact chapter where the flashback visually begins, with Gamerant citing chapter 1156 as the more concretely sourced figure. Readers going into the film shouldn't assume either number is settled fact — treat this as an open discrepancy rather than a resolved one.
The Imu question — two accounts, not one
Perhaps the murkiest part of the God Valley story right now is what role Imu actually played in it, and this is a case where two sources give genuinely different accounts that haven't been cross-confirmed against each other.
One version, drawn from a web-search-summary source, claims that Imu "transformed Rocks into a demon," and that this transformation is what forced Roger and Garp to team up against him in the first place — implying Rocks D. Xebec himself was altered or empowered by Imu ahead of or during the battle.
The other version, laid out by Beebom, suggests something different: that Imu used an Ancient Weapon — specifically Uranus — to erase God Valley Island from maps entirely, in a manner similar to the later destruction of the Lulusia Kingdom. In that reading, Imu's involvement isn't about transforming a person but about wiping an entire location off the face of the earth after the battle concluded, covering up the incident at a geographic level rather than a biological one.
These two accounts aren't compatible on their face, and neither this post nor any single source found in researching it resolves which is accurate. It's entirely possible both threads exist somewhere in the manga's ongoing rollout of God Valley material, or that one is a misreading that's spread through fan aggregation. Until a directly verifiable manga chapter or a named outlet reconciles the two, both should be treated as open, unconfirmed, and separately attributed — not merged into a single narrative.
What God Valley is not connected to
It's worth being direct about a detail that sometimes gets conflated in fan discussion: Kozuki Oden is not connected to the God Valley Incident, per any source found in researching this piece. Oden's story intersects with Whitebeard, Roger, and the Roger Pirates' crew in other, separate contexts — most notably his time sailing with Roger's crew and his history in Wano — but nothing in the available reporting ties him specifically to the events at God Valley. If you see claims linking Oden directly into this incident, treat them with skepticism until a source actually confirms it.
How the film fits into what's currently airing
Both FandomWire and Gamerant report that FILM GOD VALLEY adapts this flashback material as it's being told during the ongoing Elbaf arc, rather than functioning as a standalone side story disconnected from the current manga timeline. That's consistent with how the manga itself has structured the reveal — dropping pieces of the God Valley story gradually, through Sengoku's retelling, later confirmations of the timeline, and now an on-page flashback sequence during Elbaf, rather than delivering the whole event in one continuous chapter block.
That gradual, fragmented rollout is part of why the film is generating so much anticipation. Manga readers have been piecing together God Valley from scattered references across hundreds of chapters, filtered through an unreliable narrator, contested chapter ranges for the visual flashback, and two competing accounts of Imu's role. A feature film gives Toei room to present the incident as a single, cohesive sequence — assuming they choose to resolve any of the manga's remaining ambiguities rather than preserve them.
What to actually expect going in
Given everything above, readers heading into FILM GOD VALLEY should go in with a specific set of expectations rather than assuming the film will simply confirm one clean version of events. The core beats — Rocks D. Xebec's crew clashing with the Marine-Roger Pirates alliance, Roger and Garp's temporary partnership, the involvement of Kaido, Whitebeard, and Big Mom, and the World Government's later erasure of Roger's role — are about as close to settled fact as this story gets across CBR and Beebom's reporting.
Everything past that point is murkier. The exact on-page starting chapter for the flashback is still disputed between outlets. Imu's specific role remains a genuine open question, with two mutually exclusive accounts in circulation. And there's no guarantee the film will actually settle either of those questions definitively, especially since even the manga's own Chapter 957 account came filtered through a narrator with reason to shape the story. FILM GOD VALLEY has an opportunity to clear a lot of this up — but until Toei confirms specifics beyond what's already been reported, the honest state of the God Valley Incident is still a partially-assembled picture, not a finished one.
The film is expected to dramatize the God Valley flashback more fully than the manga has so far, but until Toei confirms specifics, expect the ongoing Elbaf arc to keep dropping manga-side clarifications first — including, possibly, a firmer answer on what role Imu actually played.