Planet of the Apes
Ok, I know it gets a bad write up. But they showed the series on Sunday mornings over here when I was a teenager, and I was right into it! I still remember being outraged that it stopped abruptly after around10-12 episodes.
It may not have been American Sci-fi's greatest hour, but it did have Roddy McDowell. And Mark 'Sarek' Lenard as a gorilla!
BRG