5. 'Grease 2'
Grease 2 didn't have John Travolta, Olivia Newton-John, Jeff Conway, Stockard Channing or even memorable songs. The studio did manage to lure back Didi Conn, but no amount of Frenchy was going to redeem this train wreck. On the bright side, it did give Michelle Pfeiffer her first major role. For that alone, Grease 2 holds an important place in history. But that's it.