The Expanse: Osiris Reborn and the Legacy of Mass Effect

The Expanse: Osiris Reborn is one of the most closely watched upcoming sci-fi RPGs, not only because it carries the name of a massively popular series of novels and TV adaptations, but also because early previews immediately sparked comparisons to BioWare’s Mass Effect trilogy. Developer Owlcat Games, best known for complex isometric RPGs like Pathfinder: Kingmaker and Warhammer 40,000: Rogue Trader, is now stepping into full 3D, squad-based, third-person action for the first time. That leap, combined with a focus on cinematic storytelling, has made players wonder: is this the spiritual heir to Mass Effect they’ve been waiting for?

The studio has been clear that while it admires BioWare’s work and borrows some structural ideas, it doesn’t see Osiris Reborn as a direct successor or replacement. Instead, the game aims to reinterpret cinematic, squad-based sci-fi through the lens of The Expanse’s grounded, politically charged universe. This article explores how The Expanse: Osiris Reborn draws on Mass Effect’s DNA, where it deliberately diverges, and why Owlcat’s RPG roots could make this one of the more intricate sci-fi adventures in years.

A New Direction for Owlcat: From Isometric Grids to Cinematic Combat

Owlcat built its reputation on intricate, CRPG-style adventures filled with tactical combat, dense character sheets, and high-stakes narrative choices. Games like Pathfinder: Kingmaker and Rogue Trader embraced classic isometric perspectives inspired by Dungeons & Dragons and tabletop design principles. Moving from that to a fully 3D, over-the-shoulder shooter is a major shift in design philosophy and technology.

According to official materials and interviews, The Expanse: Osiris Reborn is centered on a squad-based third-person shooter framework, with cover systems, active abilities, and squad commands. Space.com describes the core experience as a “third-person cover shooter” with layered RPG systems and a grounded take on space combat and politics.¹ That change doesn’t just alter the camera angle; it affects pacing, encounter design, and how narrative moments are staged.

Key differences from Owlcat’s earlier work

• Perspective: From isometric tactical views to over-the-shoulder, real-time combat.
• Combat feel: More immediate gunplay and cover usage instead of grid-based positioning and turn queues.
• Cinematic focus: Heavier reliance on cutscenes, voiced dialogue, and high-fidelity character performances.
• Controls: Direct control of aiming and movement rather than ability selection and party micromanagement.

Despite this pivot, Owlcat aims to keep its signature strengths—deep builds, dialog-driven consequences, and systemic choice—intact. The challenge is balancing responsive shooting with rich narrative branching, an area where Mass Effect’s lineage looms large.

Mass Effect’s Shadow: Inspiration Without Succession

Comparisons to Mass Effect were inevitable the moment footage showed a small squad diving into cover, firing futuristic weapons, and using abilities to control the battlefield. Mass Effect remains one of the defining sci-fi RPG series of the last two decades, known for its blend of real-time shooting, dialog wheels, and morality systems. BioWare’s own materials emphasize this mix of action and role-playing as central to Mass Effect’s identity.²

Owlcat has acknowledged that its team enjoys BioWare’s games and that Mass Effect is an important reference point, especially in terms of pacing and cinematic structure. But the developers consistently push back on the idea that Osiris Reborn is meant to replace or directly continue that series. Instead, they treat it as one of several touchstones for how to combine squad tactics, shooting, and choice-heavy storytelling in a sci-fi setting.

Shared design elements with Mass Effect

• Squad-based missions: You bring a small team into combat, each member equipped with distinct abilities.
• Cover shooting: The battlefield emphasizes environmental cover and flanking rather than simple health sponges.
• Dialog-heavy narrative: Conversations, loyalty-style missions, and relationship arcs with companions.
• Cinematic framing: Cutscenes and interactive sequences that resemble TV and film more than tabletop campaigns.

That said, where Mass Effect leaned into power fantasies, fast travel across the galaxy, and increasingly spectacular set pieces, The Expanse: Osiris Reborn aims for a grittier tone. The Expanse universe’s commitment to realistic physics, resource scarcity, and political tension gives Owlcat a dramatically different canvas.

Grounded Sci-Fi in The Expanse Universe

One of the core strengths of The Expanse as a franchise is its attempt to maintain plausible physics and socio-political realism. NASA’s educational materials often note that many popular depictions of spaceflight ignore the limitations of orbital mechanics, radiation, and life-support logistics, while franchises like The Expanse deliberately attempt to treat these elements more seriously.³ That ethos informs both the tone and gameplay of Osiris Reborn.

Rather than casting you as a galaxy-saving chosen one, the game focuses on more localized stakes within the complex politics of Earth, Mars, and the Belt. Alliances are fragile, resources are limited, and power comes more from leverage than from mystical forces or space magic. This results in a different flavor of sci-fi RPG compared to Mass Effect’s broad, almost mythic arc.

The choice to keep the story tightly tied to The Expanse’s gritty aesthetic allows Owlcat to stand apart from Mass Effect even while it borrows structural ideas. Where Shepard’s story is about saving the galaxy, Osiris Reborn’s narrative is more about navigating morally ambiguous conflicts in a system where no faction is entirely clean.

Combat, Cover, and Command: How Gameplay Comes Together

Early previews from outlets like PC Gamer and Space.com paint a picture of combat that blends cover shooting with tactical pause and squad abilities.^1,4 Encounters encourage the player to use environmental features and toolkits—grenades, drones, and other gadgets—to manage enemies rather than relying solely on raw gun damage.

Cover-based encounters

• Snap-to cover: You can quickly attach your character to cover, mitigating most incoming fire while encouraging positional play.
• Flanking and suppression: Enemy AI tries to flush you out, making static camping less viable over time.
• Destructible elements: Certain objects can be damaged or destroyed, reducing safe zones as fights progress.

The team has also implemented a tactical overlay or pause-style system that lets you issue more granular orders to squadmates, something Mass Effect experimented with but never fully leaned into. For a studio with a CRPG background, this emphasis on tactical command makes sense; it’s a way to translate their systemic combat expertise into a more kinetic framework.

RPG layers beneath the gunplay

While Osiris Reborn is clearly designed so action fans can pick up and play, Owlcat has stressed that RPG elements remain central. Based on the studio’s track record and preview coverage, you can expect:

• Character archetypes and backgrounds that influence dialog options and mechanical perks.
• Skill trees for both the player character and companions, enabling specialized builds (e.g., debuff-focused hacker vs. front-line tank).
• Gear progression where weapons and equipment can be upgraded or modified, reflecting The Expanse’s emphasis on hardware.

This layering aligns with broader trends in hybrid RPGs, where action and storytelling are increasingly intertwined. Academic work on game design notes that mixed systems like these can increase player engagement by appealing to both reflex-oriented and strategic playstyles.⁵

Choice, Consequence, and Morality Without a Meter

One of the most notable differences between Osiris Reborn and Mass Effect is the absence of a traditional morality meter. BioWare’s classic Paragon/Renegade dichotomy turned morality into a visible resource, which critics have argued risks simplifying complex ethical decisions into a points system. Research on moral decision-making in games suggests that less quantified systems can foster more nuanced player reflection, because choices aren’t immediately gamified into good vs. bad outcomes.⁵

Owlcat appears to share that philosophy. Rather than tracking your behavior on a simple axis, the game leans on:

• Faction reputation and relationships that shift based on your actions.
• Companion approval or disapproval that influences loyalty, questlines, and possibly romances.
• Branching outcomes where big decisions change future missions, available allies, or political balances.

This approach fits The Expanse’s morally gray world, where every choice is entangled in geopolitical consequences. Helping one group might secure vital resources but destabilize another region, making the narrative more about difficult trade-offs than clear heroic or villainous paths.

Companions, Crew Bonds, and Personal Stories

Companions are central to both The Expanse brand and the Mass Effect lineage, and Osiris Reborn continues this tradition. Preview information indicates a roster of multiple squadmates, each with distinct backgrounds, combat roles, and personal storylines.^1,4 These characters aren’t just mechanical tools; they’re lenses through which the player experiences The Expanse’s fractured social order.

Why companions matter in sci-fi RPGs

• Worldbuilding through perspective: A Belter engineer and an Earther officer will react differently to the same mission, providing commentary and friction.
• Emotional stakes: Personal quests and potential romances make systemic consequences feel more personal.
• Gameplay variety: Different squad combinations allow players to approach combat scenarios in multiple ways.

Owlcat’s previous games were praised for complex companion arcs and multi-stage loyalty quests, so there’s reason to expect similarly layered personal stories here. In a setting built on class divides and generational grievances, companion conflicts can organically embody the larger political drama.

Release Plans, Platforms, and Access

According to official platform listings and coverage, The Expanse: Osiris Reborn is planned for PC (including Steam, GOG, and Epic Games Store) as well as current-generation consoles. Space.com and other outlets report a spring 2027 release window, with a closed beta available to certain pre-order tiers and a Game Pass Ultimate launch on day one.^1,4

This multi-platform strategy mirrors broader industry practices, where major RPGs are increasingly expected to hit PC and current consoles at launch. Microsoft’s Xbox Game Pass, in particular, has become a key distribution channel for RPGs, offering an avenue for large, time-intensive games to reach broader audiences by lowering upfront cost barriers.⁶

While release dates can always shift, this broad rollout suggests Owlcat and its partners are positioning Osiris Reborn as a major RPG event rather than a niche spin-off of the TV series.

Standing Beside, Not Behind, Mass Effect

The Expanse: Osiris Reborn is inevitably going to be discussed in the same breath as Mass Effect, particularly given the scarcity of big-budget, story-rich sci-fi RPGs in recent years. However, Owlcat’s design choices and The Expanse’s established tone point toward a game that’s more interested in standing beside BioWare’s classic than trying to copy or replace it.

By combining squad-based cover shooting with a grounded, politically charged universe and a more nuanced approach to morality, Osiris Reborn could offer a distinct flavor of science fiction. If Owlcat manages to bring its CRPG expertise—branching narratives, intricate builds, and meaningful choices—into a polished third-person framework, the result may feel familiar in structure but unique in execution.

For players hungry for another long-form sci-fi RPG where relationships and decisions matter, The Expanse: Osiris Reborn is shaping up as one of the most intriguing projects on the horizon, not because it is “the next Mass Effect,” but because it is something that only Owlcat, working within The Expanse’s universe, is positioned to create.

Frequently Asked Questions

Is The Expanse: Osiris Reborn basically a Mass Effect clone?

No. While the game borrows some structural elements—squad-based missions, cover shooting, and cinematic dialogue—it is set in the more grounded, politically complex world of The Expanse and does not use Mass Effect’s morality system or power fantasy tone. Owlcat describes Mass Effect as an inspiration, not a template.

Do I need to know The Expanse books or TV show to enjoy the game?

The game is being positioned as a standalone story that newcomers can follow, but familiarity with The Expanse universe will likely enhance your understanding of its factions, slang, and political tensions. Expect nods and deeper context for fans, without making prior knowledge mandatory.

What kind of RPG systems can I expect?

Based on Owlcat’s past work and early previews, you can expect character backgrounds, branching dialogues, skill trees, gear progression, and companion relationship mechanics. The goal is to layer these systems beneath responsive third-person combat rather than overwhelm players with menus.

Is there a morality meter like Paragon/Renegade?

No. Instead of a visible morality score, the game emphasizes faction standing, companion reactions, and concrete narrative outcomes. Choices still matter, but they are tracked through world responses rather than a single good/evil bar.

When and where will the game be available?

Current information points to a planned spring 2027 release on PC (via Steam, GOG, and Epic Games Store), PlayStation 5, and Xbox Series X|S, with a day-one launch on Xbox Game Pass Ultimate and a closed beta for certain pre-order tiers. As always, release timelines can shift, so it’s wise to follow official channels for the latest updates.