The all-male residents of the Omicron biosphere are ectogens - persons who were, or are being, gestated in artificial wombs.
Barry Morse (Shaliff) played Victor Borgman in the first season of Space 1999. One episode of that series (Mission of the Darians) had a setting similar to that of The Starlost: a generational starship that suffered a catastrophic accident hundreds of years earlier.