The search for Serena's father is officially over.

After being MIA for nearly three seasons, 'Gossip Girl''s William van der Woodsen (played by William Baldwin) makes a surprise visit on the Upper East Side tonight, where he's reunited with Serena, Eric and -- wait for it -- Lily's current husband, Rufus.

How does his long-awaited reunion with Serena go? What trouble might he have in store for Rufus? And what happens when Eric comes out of the closet?

In an exclusive interview, Baldwin spoke to TV Squad to give us the rundown on his three-episode arc, which begins tonight at 9PM ET on the CW.

It's that time of the year. People are being cast in pilots left and right and some interesting stuff has been announced. At ABC, Christopher Titus (Titus) has landed one of the lead roles in an untitled project from Warner Bros. The show focuses on CEOs and also stars Dylan McDermott (The Practice) and Michael Vartan (Alias). McDermott and Vartan as CEOs is an easy sell. But Christopher Titus, Senior VP Harvard graduate? That's different, and something I look forward to checking out.

Carrie-Anne Moss (The Matrix) is set to star in ABC's Suspect. The show is a procedural that will solve crimes by tracking suspects through a lineup. She's joined by Eric Palladino (ER) and Kathleen Munroe (Beautiful People). The ABC track record for procedurals is less than impressive, but the addition of Guy Ritchie (Snatch) as director is intriguing enough to give this one a look.