Eddie Cahill — best known as Jennifer Aniston's former boy toy on Friends and for nearly killing Keri Russell on Felicity — will guest star on the Nov. 20 episode of Dawson's Creek. He'll play a young actor who goes after Dawson's new girlfriend. Also in November, the WB will host a Beverly Hills, 90210 reunion of sorts when Ian Ziering guest stars on Jennie Garth's new sitcom What I Like About You.