Battlestar Galactica (1978)

Told in a series of flashbacks, this episode explains the fate of Lieutenant Starbuck, who crash-landed on a planet with a Cylon Centurion, whom he befriends believing the Centurion to be the only other inhabitant - an assumption that proves false when the Centurion discovers a woman who is on the verge of giving birth to a child and who proves to be a renegade member of the same race as the Seraphs and Count Iblis.

The Cylons arrange a meeting for the purpose of making a truce but little do the humans know that the Cylons wish to destroy them. By the time they work it out it is to late. Only the Battlestar Galactica survives and Commander Adama gathers up all survivors and leads them away from chaos