The Expanse: Osiris Reborn release date update announced alongside closed beta

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Published Mar 26, 2026, 1:18 PM EDT

The Expanse: Osiris Reborn is getting a closed beta ahead of its 2027 release

A pinkwater security specialist wears a spacesuit in The Expanse Osiris Reborn

The Expanse: Osiris Reborn will be released in 2027, developer Owlcat Games announced Thursday during Xbox's Partner Preview showcase with a trailer that showed an in-depth look at new gameplay, looking more than ever like a Mass Effect successor. And that's not all: a closed beta for the game will be playable next month.

Thursday's gameplay trailer showcased the deepest look at gameplay yet, including segments of cover-based shooting and space-flight. It also offered a glimpse of the notorious "Hybrid" and showed characters walking through key locations from Expanse's setting.

Announced in 2025, The Expanse: Osiris Reborn is based on James S.A. Corey's series of popular sci-fi novels set in the near future, when Earth, Mars, and the colonies of the asteroid belt ("Belters") are locked in political struggle over the solar system's resources. If you've watched the TV adaptations, it's set during the first two and a half seasons, as Polygon learned during an August 2025 preview event. And yes, actors from the show will appear in the game in some capacity.

Even so, you don't play as James Holden or anyone of the scrappy members of the Rocinante's crew. Instead, you're a member of a team of "security specialists" (okay, we can just call them space paramilitary). In cover-based shooting gameplay reminiscent of Mass Effect, you third-person-shooter your way across key locations of Expanse canon, like Mars, Ceres, and Luna. Owlcat Games told Polygon that Osiris Reborn begins on Eros station, prior to the Eros Incident — if you know, you know — and will fight against "security specialists" from the Protogen company.

The Expanse: Osiris Reborn will be released until "spring 2027."

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