19. Marley Shelton
Worst Performances: Trojan War (1997), Valentine (2001), Scream 4 (2011)
Sometimes, being a non-factor in movies is worse than simply being bad. A prime example is Marley Shelton, who, based on looks alone, should be hard to forget. But we defy you to say her name around even the most seasoned of filmgoers and not be met with a blank stare. Following that up with mentions of Sugar & Spice, Bubble Boy, and Planet Terror will do little to joggle one's memory.