Tom Wopat is set to reunite with his former Dukes of Hazzard costar John Schneider on the latter actor's WB hit, Smallville, this season. Wopat will guest in a single episode as a childhood chum of Clark Kent's pa (Schneider) who is now a highfalutin' senator. And for those of you still having palpitations over the news that Spike er, James Marsters is tackling the recurring role of Brainiac, here's an additional teaser: The villain comes to Earth, as so many seem to, full of secrets in this case, both about the Boy of Steel's biological family and about Krypton's fate.