The Starlost - Season 1 Episode 4
The Pisces

Devon Rachel and Garth are awakened by a voice announcing the arrival of the ""Pisces."" As the crafts crew complete their linkup, a man and two women emerge and identify themselves as Commander Garroway, Captain Janice and Navigator Teale. They explain that they were launched from the ARK ten years ago to search for settling places for the ARKs population. They are shocked to return to find the ARK off-course, her crew vanished.