Season Five of Mystery Science Theater 3000 is one of the best. While some fans might be angered by Joel's departure, Joel has some of his best episodes in season five, and Mike does as well.
Eegah is one of the Joel episodes, a touching movie about a cave man's love for a woman from Beverly Hills. There's song and dance, and it's like the unholy love child of Catalina Caper and Manos the Hands of Fate (Both now availible on DVD).
The riffing level on this episode is quite impressive. Lots of good joking, bizzare references and great timing (what makes a MST3K episode brilliant) are evident. The segments aren't the best, but there are some great moments in them (especially the invention exchange).
The only problem some (not me, however) might have, is that this movie is relatively unbearable. Nothing too bad if you are used to the series, but if you've only seen one or two, and aren't too prepared for a bad movie it can hurt you.