episode of Babylon 5 (S2 E4)

episode of Star Trek: The Original Series (S2 E22)

7th episode of the second season of Star Trek: The Original Series

2nd episode of the first season of Star Trek: The Original Series

episode of Land of the Lost (S1 E15)

1st and 2nd episodes of the first season of Star Trek: The Next Generation

episode of Star Trek: The Next Generation (S1 E1)

episode of Star Trek: The Next Generation (S1 E2)

11th episode of the second season of Star Trek: The Original Series

20th episode of the first season of Star Trek: The Next Generation

7th episode of the first season of Star Trek: The Next Generation

American science fiction television series (1966–1969)

episode of Star Trek: The Original Series (S3 E17)

episode of Star Trek: The Original Series (S3 E2)

3rd episode of the first season of Star Trek: The Next Generation

1974 novel by D. C. Fontana

24th episode of the second season of Star Trek: The Original Series

episode of Star Trek: The Original Series (S3 E20)

16th episode of the first season of Star Trek: The Next Generation

episode of Star Trek: The Animated Series (S1 E2)

paperback edition (en)