Star Trek: Voyager premiered in 1995 and as the fifth installment in the franchise. The show, which ran for seven seasons, follows the adventures of Captain Katheryn Janeway (Kate Mulgrew) and the crew of the USS Voyager, who are stranded 70,000 light-years from Earth in the Delta Quadrant. On their journey home, the crew meets many allies and enemies, including an Ocampan named Kes (Jennifer Lien) and a Talaxian named Neelix (Ethan Phillips), who later became valued members of the crew. However, in the show’s fourth season, Kes is written out the series and replaced by Jeri Ryan’s popular character Seven of Nine, an ex-drone rescued from the Borg Collective by Voyager. Here’s who Kes was and why she left the show.