Here's some "TV News" scoop from the current issue of TV Guide magazine (on sale now): Former Buffy the Vampire Slayer star Sarah Michelle Gellar recently recorded an episode of Fox's The Simpsons to air in early 2004. In the episode, the Chosen One plays a kiddie delinquent named Gina who befriends Bart in juvenile detention. She later helps the bad seed escape, and the two go on the lam &#224 la The Defiant Ones.