This page contains information regarding Star Trek: Discovery, and thus may contain spoilers.
He served aboard the ISS Discovery. He attended a performance for the dedication of the ISS Charon while on the ISS Discovery. (DIS: "Terra Firma, Part 1") During this time, he helped Philippa Georgiou and Sylvia Tilly torture Michael Burnham upon her betrayal of the empire. Later on, he was killed by Saru during a struggle between Burnham's rebellion and Georgiou and several of her honor guard. (DIS: "Terra Firma, Part 2")
Originally, mirror Culber was not slated to appear along with the rest of the crew in season one. During an After Trek episode, after conceding that he didn't know what the mirror universe version of the character was like, Cruz theorized, "I think he's a bit of a mad scientist, probably doing, like, crazy, like, experimental, you know, things on aliens, kind of like the Germans did back in World War II." After Trek host Matt Mira suggested that the mirror Culber's work might be "trying to make a super soldier, like a Captain Terran," to which Cruz humorously added, "Yeah, for sure. I mean, there's definitely a goatee happening." Due to the time it took to produce all the elements needed to represent the mirror universe, the Star Trek: Discovery production staff had to be ready to have mirror universe looks for all the regular cast, including Culber. Thus, a pre-production artwork was created to demonstrate Culber wearing a mirror Starfleet uniform in primarily red medical division colors. In response to this image, Mira joked to Cruz, "I assume [it would] mean you were going to die real quick," referencing the well-known phenomenon of redshirts, and Cruz replied, "I died so quick I never got to wear it." DIS Executive Producer Aaron Harberts explained, "As we were starting to think about [Mirror] Culber and whether he would appear or not, it really was the desire that we never see him in the mirror universe, because we wanted to make sure that the image of Culber continues to stay pure and absolutely not evil. We didn't want to show that side of him, so ultimately we made the decision not to have Wilson appear in the mirror universe." Cruz actually got the opportunity to try on the costume (which both he and Harberts liked), before the idea of using it was ultimately scrapped. (AT: "Despite Yourself")