Developer Owlcat Games (Pathfinder: Wrath of the Righteous, Warhammer 40,000: Rogue Trader) had been on hand during Summer Game Fest 2025 to announce a new project, a third-person story-driven sci-fi Action RPG The Expanse: Osiris Reborn.
You play as a Pinkwater Security mercenary whose brief shore leave on the asteroid Eros spirals out of control. Trapped in a deadly lockdown and drawn into a solar system-wide conspiracy far beyond your control, you’ll have to adapt, survive, taking command of the most advanced ship in the whole of the solar system. Gather a crew and find your own path through the web of lies to leave your mark on the solar system.
“We’ve been dreaming about building a sci-fi action RPG of this scale for a long time, and The Expanse is the perfect universe to bring that vision to life,” says Owlcat’s Creative Director, Alexander Mishulin. “It’s a world grounded in realism and complexity, perfect for telling a story the way we like it — mature and character-driven, where your choices truly matter. We are excited to bring this new experience to our players and look forward to sharing more soon, especially knowing how many questions our fans will have.”
“The original Mass Effect trilogy was absolutely an inspiration to the team. It was iconic for the Xbox 360 generation of gamers. Many of us first played it in our teenage years, and it left a lasting impression,” says Yuliya Chernenko, Game Design Producer. “We are building on that legacy and expanding what players anticipate from this experience. Our story is deeply rooted in hard science fiction — one of the core reasons The Expanse universe resonates so well with its fans. The combat reflects the standards of modern action gameplay. The narrative emphasizes political tension and moral complexity. And yes — there’s romance too.”
The Expanse: Osiris Reborn – Key Features:
- Create your own captain: Play as an Earther, Martian, or Belter and take command of the system’s most advanced ship. Shape your journey through identity, leadership, and the pressure of survival.
- Lead a crew: Your companions are more than squadmates — they have pasts, motives, and a voice in your story. Your leadership decisions will determine how squadmate loyalty shifts under pressure.
- Tactical third-person combat: Implement real-time strategic cover mechanics using various abilities and squad coordination. Bring two companions into combat while others support from behind the scenes.
- Explore a divided solar system: Travel across iconic locations from the TV show and books, like Ganymede, Ceres, Mars, and Luna. While traversing the various environments, players must uncover secrets and influence outcomes through their skills and decisions.
- A story-driven RPG true to The Expanse: Immerse yourself in a narrative grounded in tension, consequence, and the complexity of humanity’s future among the stars
