Babylon 5: Thirdspace is a 1998 American made-for-television film that is part of the Babylon 5 science fiction universe. It was written by J. Michael Straczynski and directed by Jesús Salvador Treviño. The horror-based story, which ties into the Shadow/Vorlon plotline, centers on the return of an ancient and overwhelming alien force which had once attempted to destroy life in the Milky Way.