Dark Matter (2015) Series Breakdown
The Syfy series Dark Matter ran for three seasons between 2015 and 2016, adapted from the comic by Joseph Benavente. It follows a crew of six amnesiacs who wake up aboard a massive starship called the Raza with no memory of who they are or why they were there. The core concept is straightforward enough that it carried the entire show, but getting the cast details right matters because the character dynamics are built around those identity reveals. Here is the complete main cast and what each character represents in the story: Joel Kinnaman as Six / Jim Holden — The de facto leader of the group. Kinnaman plays the most physically capable crew member, and his arc centers on discovering that he was a former soldier turned pirate before the memory wipe. His real name, Jim Holden, only gets revealed later in season one. The character is deliberately written as someone who leans on instinct rather than strategy, which creates friction with other crew members who preferred a different captain.
Alex Mallari Jr. as Five / Jack — The tech specialist and engineer of the group. Mallari brings a calm, methodical energy to the role that contrasts with Six's impulsive leadership. Jack's backstory involves him being a mechanic and hacker on the run before the amnesia event. What stands out in his performance is the way the character gradually becomes the moral center of the group, even though he starts out the most detached. Jasika Nicole as Four / Bettie — The navigator and pilot. Nicole's character is sharp, skeptical, and often the first to call out when someone in the group is being dishonest. Bettie's real identity is tied to a corporate espionage backstory that becomes relevant around the midpoint of season one. She has the most complicated relationship with the rest of the crew because her pre-amnesia self was considerably more ruthless than the person she becomes. Patrick Gallagher as Three / Porter — The enforcer and closest thing the group has to a muscle. Gallagher is a tall actor with a distinctive voice, which helped the character stand out visually even in early episodes where the crew's individual roles weren't fully established. Porter's backstory involves criminal violence, and the show uses his condition to explore whether someone can change their nature after losing their memories. The actor's physical presence makes many of his scenes carry weight without dialogue.
Wong Kar-Wai as Two / Ratch — The alien of the group. This is one of the more interesting casting choices because Ratch appears as a large, non-human entity but serves as the group's medic. The actor performs in a full-body suit, which limits facial expression but the movement design compensates for it. Ratch's origin and species become a running mystery through the first season, and the practical effects hold up reasonably well for a cable sci-fi budget. Gloria Votsis as One / Alice — The most controversial character in the cast. Votsis plays a crew member who is charming, flirtatious, and deeply unreliable. Alice's true allegiance is the central twist of the first season, and the actress sells the ambiguity throughout. Some viewers found the character frustrating, which was arguably the point. Her backstory involves manipulation and betrayal that directly impacts every other character by the time season two rolls around. Josh Helman as Ethan Wei — Appears in the first season as a recurring antagonist before becoming part of the main ensemble. Ethan is a bounty hunter and the brother of another major character, and his conflicts with the Raza crew drive a lot of the early tension. Helman brings a grounded intensity to the role that makes Ethan feel like a real threat rather than a plot device.
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Coby Bird as Ratch — Sometimes listed separately from Wong Kar-Wai's credit depending on the episode, Bird appears in the supporting crew capacity during later episodes. The dual credit arrangement comes from stunt and body-performing work on the Ratch suit during certain production schedules. I spent an afternoon tracking down episode-by-episode cast changes because the credits on streaming platforms are inconsistent. What I found is that several episodes list the Ratch performer differently between seasons, and some regional releases combine or split names in ways that don't match the original production company's records. The workaround was checking the official Syfy press materials and cross-referencing with IMDb's full episode credits rather than relying on any single platform's cast page. If you need definitive sourcing for a project, the DVD/Blu-ray episode listings remain the most reliable reference point since they go directly from the studio masters. A few things people get wrong about this cast that are worth noting. The numbering system (One through Six) does not correspond to how important the characters are or their rank on the ship. It refers to their position in a cloning or creation sequence from the show's lore, which is a detail the series never explains clearly upfront. Another common mistake is assuming the characters retain consistent personality traits across all three seasons. The amnesia premise means each character's behavior shifts significantly once they recover fragments of their past, and the writing sometimes handles that transition unevenly.
The supporting cast includes actors like Jessica Harmon as Agent Weaver, who operates as a Federation representative and primary antagonist in season one. Her role is less about action and more about bureaucratic pressure, which gives the show a different kind of tension than typical space adventure fare. Sean Rogerson appears as Captain Jonas, another Federation figure whose interactions with the crew reveal how the political structure of the show's universe actually functions. These supporting roles fill in gaps that the main six characters cannot address on their own. If you are looking for a reference guide for this show, the cast information above covers the core ensemble and the key recurring players. The series itself is uneven, especially in its second season, but the performances from the main cast are consistently competent. Joel Kinnaman carried the lead role despite some writing inconsistencies, and the rest of the ensemble supported him well enough to make the premise work across all three seasons.
