Battlestar Galactica: Lost Planet of the Gods, Part 2 (1978)

In the concluding episode of a two-part story, the disease-weakened convoy, led by Galactica's commander Adama (Lorne Greene), have found an ancient planet that may well be the gateway to the long-lost 13th colony of Mankind (once known as planet earth). With Galactica's male personnel afflicted by illness, it is up to the vessel's courageous woman warriors to hold down the fort. Meanwhile, the treacherous Baltar (John Colicos) is hurriedly mounting a Cylon attack against Galactica--an attack that will have particularly tragic consequences for Adama's son Apollo (Richard Hatch). ~ Hal Erickson, All Movie Guide