The Expanse Osiris Reborn Gameplay Preview: Ganymede Goes Loud

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Store links: The Expanse: Osiris Reborn on Steam

A quiet Ganymede job turns into the game’s clearest action-RPG test yet

Owlcat Games has shown a longer look at The Expanse: Osiris Reborn gameplay centered on a mid-game mission on Ganymede, and the practical takeaway is sharper than a normal trailer beat: this is being sold as a story-led sci-fi action RPG where an undercover objective can collapse into squad combat, creature panic, and a leadership choice under pressure.

According to GamingBolt, the new “Beetle in the Anthill” footage follows the player character and their identical twin, J, as they go undercover inside a Protogen base while posing as Osiris branch members. GameSpace and RPG Site both report that the mission objective is to recover stolen data from Pinkwater station, with the broader crew helping through tech support and moral backup. The setup begins as infiltration, conversation, and exploration, then turns violent when a bioengineered threat is released inside the facility.

That structure is the key signal for players trying to read Osiris Reborn before release. The footage is not presenting stealth as a clean sandbox where the perfect route is the whole fantasy. It is presenting stealth as narrative compression: a false calm, a failed cover, a sudden alarm state, and then an escape plan built while the walls are already coming apart.

The mission flow looks closer to directed RPG drama than pure stealth

The Ganymede sequence starts with disguise and dialogue rather than immediate gunfire. RPG Site, quoting Owlcat’s trailer description, says players explore the base undercover, meet Protogen employees, and try to talk their way into a storage area before the mission breaks down. VGTimes likewise describes the operation as undercover movement through a secret Protogen base that does not stay quiet for long.

That matters because the footage positions dialogue as part of the mission rhythm, not a separate menu-driven pause before the action. GameSpace says Owlcat highlighted cinematic storytelling, action combat, exploration, and a deep dialogue system in the same showcased mission. The source material does not confirm how many alternate routes the level has, how failure states work, or whether players can keep the mission quiet indefinitely. What is confirmed is the intended blend: talking your way forward, moving through a hostile facility under a cover identity, then adapting when the situation changes.

For players asking whether The Expanse game is an action adventure with RPG dressing or a sci-fi action RPG with cinematic set pieces, the answer from this preview sits in the middle but leans RPG. The mission is framed around identity, crew support, and consequences, while the actual playable pressure appears to arrive through cover shooting and squad orders once the disguise falls apart.

Combat is cover-based, squad-driven, and deliberately compared to Mass Effect

Polygon’s Gamescom 2026 hands-on is useful context because it confirms the feel behind the trailer comparisons. After playing 90 minutes of a mid-game level, Polygon described Osiris Reborn combat as third-person, cover-based shooting where the player directs two squadmates to perform strategic actions, and explicitly said the Mass Effect comparisons are accurate. GameSpace’s feature list lines up with that read, describing real-time strategic cover mechanics, abilities, squad coordination, and the option to bring two companions into combat while others support from outside the active party.

The Ganymede footage gives that combat a specific shape. GamingBolt reports that the player character and J get into gunfights with Protogen after their cover is blown. CBR noted that the trailer shows combat abilities and environmental elements, while also observing that some shots show the player standing in the open and aiming slowly, which may not fully represent how a cover shooter plays moment to moment.

That caveat is worth keeping. A trailer can show intent, pacing, and enemy type, but it cannot prove encounter tuning. What the footage does show is a combat rhythm built around sudden escalation rather than arena clearing for its own sake. The shooting appears to be the consequence of a botched or interrupted infiltration, and the larger set piece is about surviving a threat that does not care which human faction it tears through.

The hybrid changes the mission from firefight to chase scene

The strongest set-piece detail is the creature itself. GamingBolt describes a monster that invades the Protogen base, attacks without distinguishing between sides, then pursues the protagonist and J after they deal with enemy soldiers, ripping through doors to reach them. RPG Site identifies the threat as a bioengineered menace, while CBR connects the footage to The Expanse’s Protomolecule Hybrids and notes the game’s version appears fast and resilient, leaping toward characters through gunfire.

That is where Osiris Reborn starts to look less like a standard cover-shooter room and more like a cinematic sci-fi adventure with tactical pressure. Protogen soldiers give the scene its human opposition. The hybrid gives it velocity. Once the creature enters, the mission’s question changes from “can you win the fight cleanly?” to “can you improvise long enough to escape?”

GamingBolt reports that UN soldier Michael helps the siblings form a plan to lure the monster into the dome and focus its lenses to fry it. That detail suggests Owlcat is building at least some encounters around environmental solutions and staged objectives, rather than relying only on enemy health bars. It also fits The Expanse’s grounded survival tone: the best answer to an impossible threat is not hero posing, it is a dangerous technical workaround executed under fire.

The choice with J is the preview’s most important RPG signal

The footage’s clearest choice, as reported by GamingBolt, comes when the player must decide whether J should evacuate the Agritechs, leaving the player against the monster, or whether to abandon them entirely. VGTimes also reports Owlcat’s broader claim that Osiris Reborn uses consequences that may appear later rather than immediately after a decision.

Those two points are doing a lot of work. The J decision is not described in the source material as a morality meter moment, a faction score change, or a simple good-versus-evil prompt. It is framed as a leadership call during a collapsing mission: protect civilians and increase immediate danger, or preserve the mission team’s survival odds by leaving them behind. That is a useful preview of the kind of pressure Owlcat seems to want from The Expanse setting, where human systems, corporate violence, and survival math are often inseparable.

GameSpace’s listed features support that reading. The player creates a captain as an Earther, Martian, or Belter, leads a crew with shifting loyalty, and makes decisions shaped by identity, leadership, and survival. None of the provided sources confirms the long-term outcome of the Agritechs choice, so players should treat it as a demonstrated example of decision framing rather than proof of branching campaign depth. Still, it is the moment in the Ganymede preview that most clearly argues for Osiris Reborn as an RPG first.

Owlcat is making a risky genre jump, and the footage shows both promise and open questions

CBR notes that Osiris Reborn is Owlcat Games’ first third-person RPG, a significant departure for a studio known for isometric CRPGs. That context is important. The Ganymede mission shows Owlcat translating its usual interests, including party dynamics, choices, and narrative consequence, into a real-time action format where animation, cover behavior, enemy readability, and cinematic pacing matter just as much as dialogue trees.

There are encouraging signs in the provided reports. Polygon’s hands-on says the combat comparison to the original Mass Effect trilogy is fair. GameSpace and RPG Site both describe a mission that combines exploration, dialogue, squad support, and action rather than isolating those systems. GamingBolt also says the newer showing demonstrates broad improvements, especially in voice acting, while noting that the male leads had been recast after closed beta feedback.

There are also unresolved questions. CBR found the trailer an odd combat showcase because some clips did not necessarily communicate the practical feel of cover-shooter play. The sources do not provide frame rate targets, PC requirements, performance impressions on console, pricing, edition details, or a final date. They also do not establish how open the levels are, how often stealth can remain stealth, or how much the story branches beyond delayed consequences. For now, the safest read is that Osiris Reborn is aiming at directed, authored missions with RPG decision points and squad-based combat pressure, rather than a systemic stealth-action sandbox.

Release window, platforms, and who should keep watching

The Expanse: Osiris Reborn is currently scheduled for spring 2027. GamingBolt lists Xbox Series X/S, PlayStation 5, and PC, while GameSpace specifies PC availability through Steam, Epic Games Store, and GOG alongside Xbox Series X|S and PS5. No final release date or price is confirmed in the provided sources.

For existing Expanse fans, Polygon reports that Osiris Reborn takes place concurrently with events from seasons 1 through 3 of the TV series, or Leviathan Wakes and Caliban’s War for book readers, and follows a custom character rather than James Holden and the Rocinante crew. Polygon also reports that Holden appears in some capacity, though he was not present during its preview. That setup gives Owlcat room to brush against known events without asking players to replay the central canon from the usual seat.

For action-RPG players, the Ganymede footage is worth tracking because it shows the game’s intended loop under stress: infiltrate, talk, get exposed, coordinate with companions, survive the monster, and make a costly call. If that sounds appealing, Osiris Reborn should stay on your 2027 watchlist. If you are waiting for proof of polished shooting, performance stability, or meaningful branching across the full campaign, the current The Expanse Osiris Reborn preview material is promising but not enough to settle those questions.