The plot of the show is that a janitor (Joel) was cleaning a satellite is launched into space by his evil boss. On the satellite he builds some robots to keep him company. His evil boss conducts psychological experiments on Joel by sending him the worst movies he can find. He keeps his sanity by making funny comments about the movie. It was on Comedy Central and Sci-fi before it was finally taken off the air. It continues on with the original cast in riff-trax that sell mp3's of modern movies like Twilight, Harry Potter, etc. That can be played over the movie to mimic the comments."
And if you haven't seen it? For god's sake
EDUCATE YOURSELF!!
Clips from episodes out of context usually
http://www.youtube.com/watch?v=_EAXYH4b4yMA short film about keeping clean and neat (much funnier)
http://www.youtube.com/watch?v=QRB3xDg5pnU