Star Trek: Voyager: Season 5
After Seven of Nine (Jeri Ryan) spent much of Voyager's fourth season trying to resist the pull of the Borg, and just when the tide of battle seemed to be turning, she returns to the Collective in a memorable confrontation with the Borg Queen (Susanna Thompson) in the centerpiece story of the fifth season, the two-part "Dark Frontier." The Borg also factor into the nightmare-laden "Infinite Regress" as well as "Drone," in which a strange Borg-human-EMH hybrid teaches Seven the experience of parenthood, of sorts.