Atomfall, the BAFTA-winning British post-apocalyptic game, is becoming a TV series

The people behind Fleabag are adapting Atomfall into a TV series. Rebellion, the Oxford-based studio that made the game, has announced a co-production deal with Two Brothers Pictures, the company founded by Emmy and Golden Globe-winning writers Harry and Jack Williams. The game drew 3.7 million players after its early 2025 launch and won Best British Game at the BAFTA Games Awards in April 2026.

The game

Atomfall is a first-person RPG shooter set in a quarantined version of the Lake District, built around a fictional escalation of the real 1957 Windscale nuclear accident — the worst nuclear disaster in British history. The premise is closer to a British folk-horror thriller than a straight post-apocalypse shooter, blending Cold War paranoia, ancient mythology, and creeping dread. Players often compared it to S.T.A.L.K.E.R., though the setting is distinctly and deliberately English.

Rebellion, founded in 1992 and best known for the Sniper Elite series, is one of the UK's largest independent studios. The Kingsley brothers — Jason and Chris, co-founders of Rebellion — are attached to the project on the studio side.

The adaptation

Harry and Jack Williams will write and executive-produce the series alongside Alex Mercer, whose credits include Doctor Who and The Tourist. Per Deadline, the deal brings together two sets of brothers: the Williams duo and the Kingsley duo.

"There's something very exciting about expanding this strange, unsettling story for television," the Williams brothers said in the announcement, per Games Press.

What's still unknown: which broadcaster or streaming platform will air it, when it premieres, who will star in it, and whether the series will follow the game's plot or build out the wider mythology independently. No cast, no release window, no channel — this is an early-stage development announcement.

What to watch for

The Williams brothers have a strong track record with morally ambiguous, tonally precise British drama. That pedigree fits Atomfall's atmosphere well. But video game adaptations — even successful ones like The Last of Us and Fallout — take years from announcement to screen. This one is earlier in development than either of those were at their first announcements. Expect a long wait before anything more concrete emerges.