Edited down episodes "The Pisces" and "Farthing's Comet" from the 1973 television series "The Starlost" for this 1980 telemovie.
The Ark craft "Pisces" has been on a mission to locate habitable planets for ten years, while on the Ark, 409 years have passed. The Ark's chief astronomer had changed the Ark's course so he could study a comet: Unfortunately, debris has damaging the Ark.—Paul Gerard Kennedy