There are lots of older Scadians who haven't seen KnightRiders either. Firstly, it's obscure, even compared to the bunch Caitlin listed (relative to the mainstream). Second, it's interminable. It's really best experienced at a party when you can watch some, then chat with a friend, then watch some more. It has some interesting cameos, notably Stephen King and the woman who played Lyta on B5. It's loosely based on the schism with the SCA that created Acre.

Somewhere I heard tell of a list of those "sca should see" movies but I don't see it at waks.org -- Maybe I'm oblivious today.