What We Left Behind: Looking Back at Star Trek: Deep Space Nine

What We Left Behind: Looking Back at Star Trek: Deep Space Nine is a documentary about the science fiction series Deep Space Nine and the reputation it built over time. It examines how the show was once regarded as an outlier within the Star Trek franchise and later came to be seen as one of its strongest entries, and it brings together members of the cast, who look back on their work on the series, along with writers from the original production team, who discuss what an imagined eighth season of the show might have contained.

The film is directed by David Zappone, working with Ira Steven Behr. In Zappone's filmography it comes before To the Journey: Looking Back at Star Trek: Voyager, released in 2024. Among the credited cast of 35 are Avery Brooks, Terry Farrell, Michael Dorn, René Auberjonois, Nana Visitor and Alexander Siddig, all appearing as themselves. It runs 116 minutes and was produced in the United States by 455 Films and Le Big Boss Productions. On TMDB it holds a rating of 7.1 out of 10 from 57 votes, a small but favourable sample that suggests the documentary was well received by those who sought it out.