Assignment: Earth

"Assignment: Earth" is a second season episode of Star Trek: The Original Series. It was first broadcast on March 29, 1968, as the last original episode in the second season, and repeated on August 9, 1968. It is episode #55, production #55, written by Art Wallace, based on a story by Wallace and Gene Roddenberry, and directed by Marc Daniels.

This episode served double duty, not only as an episode of Star Trek, but as a backdoor pilot for a proposed spin-off television series, that would have been produced by Roddenberry, under the same name, Assignment: Earth. The show would have featured actor Robert Lansing as Gary Seven, a futuristic "James Bond," as the lead character. The episode stars Teri Garr as Roberta Lincoln, who would have been a co-star in the series, had it continued on its own.

Overview: Time traveling to 1968 Earth, the Enterprise encounters an interstellar agent who intervenes in 20th Century events.