Yeoman Karen Greene was a female Human Starfleet crewmember serving aboard the Federation starship USS Enterprise in the 2260s. Greene served in the command division, as the ship's materials officer, sometimes performing duty on the ship's bridge. Greene was on the bridge when the Enterprise was searching for the wreck of the Constellation. (CCG set: Basic, card: "Karen Greene"; TOS episode: "The Doomsday Machine") The name on the CCG card was assigned to an image of an extra who had only the briefest onscreen appearance in "The Doomsday Machine".