Lee Majors is best-known for his role as the Six Million Dollar Man, but the TV star also appeared in a Western series that rebranded itself in its last season.

Harlan Ellison created this 1970s sci-fi series, although the show didn't work out the way the revered writer had hoped.

Leif Erickson appeared in one episode of a 1970s sci-fi series that was inspired by the real-life Project Blue Book, a government study of UFOs.

From time-traveling Time Lords to cylons who look human, sci-fi TV has spent seven decades imagining tomorrow. Vote up the shows that defined the genre and vote down the ones that don't belong in the ...