Owlcat Games used the March 26 Xbox Partner Preview showcase to finally put a release window on The Expanse: Osiris Reborn. The studio’s upcoming sci-fi action RPG is heading to PC, Xbox Series X|S, and PlayStation 5 in Spring 2027, with day-one availability on Xbox Game Pass Ultimate. It will also support Xbox Play Anywhere and be available via Steam, Epic Games Store, and GOG on PC.
Alongside the release window, a closed beta was announced for April 22, 2026, on Xbox Series X|S, PS5, and Steam. Access requires purchasing either the Miller’s Pack or the Collector’s Edition from the game’s official site. The beta includes a full mission set on Pinkwater 4 station and runs all the way up until the game’s launch.
What Kind Of Game Is It
Osiris Reborn is a third-person, cover-based action RPG set in James S.A. Corey’s The Expanse universe. You play as a Pinkwater Security mercenary whose shore leave on the asteroid Eros goes sideways, pulling you into a solar system-wide conspiracy. Players create a custom captain — Earther, Martian, or Belter — and take command of a crew aboard what is described as the most advanced ship in the solar system.
The game visits locations from the source material including Ganymede, Ceres, Mars, and Luna. Two companions fight alongside you in the field, while the rest of the crew assists from a distance — disabling systems or drawing enemy fire — through a new mechanic called the Exploit system.
The Exploit System And Companions
The Exploit system is central to how companions function in combat. Each crew member carries one of four Exploit types — Precision, Demolition, Malfunction, or Cyber-attack — that let them intervene decisively during a fight, with the potential to clear entire groups of enemies in a single action.
The roster confirmed so far includes J, the player’s identical twin who serves as executive officer; Teo, a combat medic who lost his medical licence on Earth; Regina, a sniper and infiltrator with a deliberately guarded backstory; Polly, a young shipgirl who provides suppressive fire and explosives support; Aleesha, an electronic warfare specialist; Zafar; and Michael, a disillusioned ex-UN military gunner. The twin J adapts their appearance and gender to match the player’s custom character.
The AI Disclosure
The showcase coincided with a press briefing in which Owlcat PR manager Katharina Popp confirmed to Eurogamer that the studio is using generative AI during development — for prototyping, placeholder assets, and early-stage iteration. She was explicit that no AI-generated content is intended to ship in the final game, and that writing and voice acting will be entirely human-made. The admission still drew community backlash, arriving shortly after Crimson Desert developer Pearl Abyss came under fire for AI assets found in their shipped title. Owlcat had previously acknowledged using AI tools in a 2024 job listing, making this a continuation of a longstanding and still unresolved tension.
What This Means For Fans
The Expanse: Osiris Reborn is Owlcat’s first AAA-budget project and its first third-person RPG, a step beyond the isometric CRPGs the studio built its reputation on with Pathfinder: Kingmaker, Pathfinder: Wrath of the Righteous, and Warhammer 40,000: Rogue Trader. Comparisons to Mass Effect have been unavoidable since the game was first revealed in June 2025, and the new gameplay footage does little to discourage them. Whether Owlcat can transfer its strengths in companion writing and choice-driven storytelling to a more action-oriented format is the key question — one that the April beta will begin to answer.