The Expanse: Osiris Reborn is Mass Effect-style RPG coming to Xbox Series X|S & more

Owlcat Games is diving into sci-fi with The Expanse: Osiris Reborn, a third-person, story-driven action RPG based on the hit TV series and books. Known for isometric titles like Pathfinder and Warhammer 40K: Rogue Trader, the studio is shifting gears to deliver a cinematic, choice-heavy RPG more in line with Mass Effect.

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Set during the first two-and-a-half seasons of the show, players take on the role of a Pinkwater Security mercenary trapped on Eros Station. You’ll build your own captain—Martian, Belter, or Earther—assemble a squad, fly your ship, and travel to iconic locations like Ceres and Mars.

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Owlcat promises party-based combat with real-time gunplay, branching dialogue, and romance options. Some actors from the show are even returning, though no names yet. The team openly cites Mass Effect as a core influence, and they’re leaning into the moral complexity and grounded sci-fi tone that defines The Expanse.

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No release date yet, but The Expanse: Osiris Reborn is coming to PS5, Xbox Series X|S, Steam, Epic, and GOG. And despite juggling other projects, Owlcat says this is their “flagship.”