Darkstar: Terror at The Edge of Time (1970)

With the destruction of planet Earth imminent, four spaceships are deployed with an impossible mission-to travel back in time and prevent the global endgame from ever occurring. The captain of the last-remaining ship must rely on the help of opinionated robots and his pilot to fight alien beings, uncover rogue adversaries, and to reach Darkstar: the portal to the past and humanity's last hope.