The Expanse: Osiris Reborn delivers an original story of survival and loyalty, and significantly expands the world of The Expanse depicted in the TV show and novels.

By the 24th century, humanity has conquered the cosmos. However, life has remained anything but easy. In The Expanse: Osiris Reborn, a story-driven sci-fi Action RPG, 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.

Create and customize your own captain — Earther, Martian, or Belter — and lead a crew of highly-skilled specialists as you face off against escalating threats, political pressure, and a relentless enemy that will stop at nothing to see you dead. In a solar system held together by fragile alliances, every decision leaves its mark.

You’re no hero — just a merc caught in the wrong place at the wrong time, trying to hold your crew together and keep the ship up and running. Your choices will shape your story.

Your companions are more than just mission assets — they are people with their own scars and loyalties. Some chase redemption. Others hide their truths. Over time, your relationships will flourish or deteriorate depending on the choices you make and how you choose to lead. The ship becomes your home — a place where trust is earned, not given.

Fight in third-person utilizing cover-focused gunplay and abilities. Two companions will accompany you into the field while others will support from a distance: disabling systems or drawing the enemies’ attention. You will issue real-time commands and have to adapt quickly to survive the manifold threats the system will throw at you.

Visit iconic locations like Ganymede, Ceres, Mars, and Luna. Walk through ruined habitats and political strongholds mired in unease and tension. Talk to the locals. Uncover secrets. Use your skills to influence what happens next. The system looks different from every planet and from every asteroid. Some are falling apart. Others just hide it better. You may even come across a familiar face or voice that reminds you of just how small the system really is.

Owlcat Games unveiled a new dev diary for The Expanse: Osiris Reborn, showcasing how the studio approaches depicting the distinct Belter culture known from the show and books.

Lang Belta or Belter Creole is the language the inhabitants of the asteroid belt and outer planets have developed over generations by mixing cultures and adapting to the realities of survival in the belt. The language was created by linguist Nick Farmer for the Expanse TV show. It is a creole of English, Romance, Germanic, Slavic, Asian, African and Middle Eastern languages, reflecting how the Belt is a melting pot of ethnicities but also showcasing how different it is from Earth and Mars.

The language also comprises a number of expressive gestures originally used by Belters to make communication in bulky space suits and helmets easier. Belters use them both when talking Lang Belta and when using English, since the gestures have become so ingrained in their culture and upbringing.

Translating (pun intended) this language and gesture system from the show into a video game came with specific challenges and opportunities that the developers tackled with the help of Nick Farmer as well as specialist in gestures and motion capture, Roberto Campanella.

For example, while the developers originally intended to simply create a new set of movements for NPCs based on Belter gestures, they soon realized that the intensity of each gesture differs depending on context and the user’s emotional state and intent. Some of the gestures also looked very impressive during mocap but appeared different when transferred to in-game models because of body proportions or lighting, so the choreography was adjusted until every movement felt clear and believable. The team also needed to make sure that each character’s use of slang, gestures, and switching from Belter to English made sense given context and socioeconomic situation.

But it was important to get it right, since Belter culture is an integral part of what makes the world of The Expanse: Osiris Reborn feel lived-in, authentic, and believable, with various gameplay consequences: if the player is from the Belt, they can speak Lang Belta, will get unique dialogue options and opportunities, understand conversations that make no sense to characters from the inner planets, and can get concessions from Belter characters based on their linguistic skills. However, playing as an Earther or a Martian means they will need to earn the trust of their Belter vis-à-vis first.

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

The Expanse: Osiris Reborn is coming to PS5, Xbox Series X|S and PC (Steam, Epic Games Store, GOG) in Spring 2027.