Erstwhile Man of Steel Christopher Reeve will guest-star on a February sweeps episode of the WB's Superman prequel series Smallville. As reported by J. Max Robins in the Jan. 18 issue of TV Guide magazine (on newsstands Jan. 13), Reeve will play Dr. Swan, a brilliant scientist who provides Clark Kent (Tom Welling) with revelatory insight into his superhero destiny. A lure for Reeve to return to the Superman franchise was the willingness of the WB to run a public-service announcement at the end of the episode for the Christopher Reeve Paralysis Foundation. "Chris is a Smallville fan," says a show insider. "He's told friends [Welling] reminds him of a young Chris Reeve."