SEASON FINALE: If you've been following Apt. 23, you know James Van Der Beek, who plays an exaggerated version of himself on the show, was cast on Dancing With the Stars, only to find he's competing against his nemesis, Dean Cain. In tonight's finale, Dawson discovers that Superman's DWTS dressing room is bigger than his own. Ouch. Dean Cain guest-stars as himself.