The Boys Unleashes Its Most Disturbing New Character Yet
Season 5 of The Boys has never shied away from grotesque invention, but Episode 4 — "King of Hell," released on Prime Video this week — may have delivered its most unsettling creation to date. Quinn, a minor villain played by Kris Hagen, arrives as a barely recognizable human figure fused to the walls of Fort Harmony, an abandoned Vought medical facility, his body overtaken by plant-like tentacles that have been slowly consuming him for decades. He cannot move. He can barely be identified as human. And yet, his presence stops one of the show's toughest characters dead in his tracks.
The character has become one of the most discussed elements of the episode, generating significant online conversation about who Quinn really is, what his relationship to Soldier Boy (Jensen Ackles) means, and what his introduction signals for the expanding Boys universe.
What Happens at Fort Harmony
Episode 4 sends multiple storylines converging on Fort Harmony, the site where Vought's earliest Compound V experiments — specifically the V-One trials — were conducted in the mid-20th century. Homelander (Antony Starr) is after the serum because it could grant him immortality. Soldier Boy is there to stop him. The Boys, meanwhile, are navigating the facility while increasingly turning on one another, their aggression amplified by something in the air and water around them.
The culprit turns out to be Quinn. A former V-One test subject from the same era as Soldier Boy, Quinn survived the trials — barely — but the compound transformed him into a human-plant hybrid, emitting hate-filled spores that trigger rage and paranoia in those nearby. He has apparently been trapped at Fort Harmony for decades, slowly merging with the building itself. It is Frenchie (Tomer Capone) who pieces this together, and it is ultimately Soldier Boy who ends the threat by using his chest-blast power to destroy Quinn.
A Backstory That Changes Everything We Know About Soldier Boy
The significance of Quinn extends well beyond his role as a one-episode monster. His existence — and Soldier Boy's reaction to encountering him — cracks open the carefully constructed myth of the gruff, war-hardened supersoldier.
As Homelander reveals in the same episode, Soldier Boy was not the heroic, self-made figure his persona suggests. He was, by all accounts, a wealthy and spoiled young man who was deeply jealous of his own brother — a decorated, real-life soldier who earned the Silver Star for bravery at Anzio. Driven by envy rather than patriotism or bravery, the future Soldier Boy reportedly begged his father to gain access to Frederick Vought's experimental trials, entering the program from a position of privilege rather than service.
Quinn, by contrast, was a legitimate soldier who had seen actual combat. He reportedly despised his trial companion for being exactly what he appeared to be: a rich kid playing at heroism. That contempt, it seems, never faded — it was preserved, along with Quinn's body, inside Fort Harmony.
Is Quinn Soldier Boy's Brother?
One theory circulating widely among fans and entertainment outlets is that Quinn may actually be Soldier Boy's unnamed war-hero brother. The circumstantial case is notable: both are soldiers from the same era, both underwent V-One trials, and the timing of the episode's reveal about the brother feels deliberately placed alongside Quinn's introduction. The emotional weight of Soldier Boy's reaction to killing him — he is visibly shaken and despondent — suggests there is more to the relationship than a shared Vought experiment.
However, the theory has a notable flaw: Quinn apparently resented Soldier Boy partly for coming from wealth, which would be an odd grievance to hold against one's own sibling. It remains possible that Quinn is simply another test subject whose history with Soldier Boy is more personal than professional, without a blood connection. The show has, for now, left the question open.
Why This Matters: Vought Rising and the Expanding Universe
The broader significance of Quinn's introduction lies in what it signals for Vought Rising, the upcoming 1950s-set prequel series led by Jensen Ackles. The Boys is in its final season, and the show's writers are clearly threading narrative connective tissue toward the spinoff.
Fort Harmony itself is emerging as a location central to both series. It is where Soldier Boy was injected with V-One by Frederick Vought — an event audiences have not yet seen dramatized. It is where Quinn was left to mutate in isolation. It is also where, in Episode 4, the trail of V-One leads to Bombsight, another first-generation supe and a confirmed major character in Vought Rising, played by Mason Dye. Bombsight, it is revealed, has already retrieved whatever serum remained at the facility before the Boys or Homelander could reach it.
The parallel introduction of both Quinn and Bombsight in the same episode is unlikely to be accidental. Together, they sketch out a generation of Vought's earliest super-powered subjects — some successful, some catastrophically not — whose full stories will presumably be told in the prequel.
A Pattern of Expanding Lore
This approach mirrors a broader trend in prestige television franchises, where flagship shows in their final seasons increasingly function as launchpads for spinoff content. The Boys has already used Season 5, Episode 3 as what many critics described as a backdoor pilot for Vought Rising. The Quinn storyline deepens that investment, giving the prequel a ready-made emotional anchor in a character whose origins, motivations, and relationship to Soldier Boy remain only partially explained.
For viewers who have followed The Boys since its debut, Episode 4 represents a turning point. Soldier Boy, long presented as a one-note villain — brutal, narcissistic, unreflective — is being reframed as a man haunted by the fraudulence at the core of his own identity. Quinn, rotting inside the walls of a forgotten facility, is both a literal and metaphorical monument to what Soldier Boy's luck and privilege cost others. Whether that cost includes a brother's humanity is a question Vought Rising may be uniquely positioned to answer.
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