Best episode so far
The Man Who Was Never Born with Martin Landau
Earth awaits a terrible fate in the far future, so a 20th Century astronaut and a typically hideously malformed future Earthling go back in time hoping to change history. They target a beautiful young woman just before she gives birth to the scientist who created the bio-warfare agent which ravages the future Earth and all humans. But how can the repulsive Andro succeed when he's likely to be shot on sight ?