Michelle Trachtenberg reprises her role as Georgina Sparks, and she returns to the Big Apple as a very different person. However, some things never change: Chuck and Nate find their friendship in peril as they fight over Blair, just as they did last year. Meanwhile, as Serena grows closer to her new beau, Gabriel, things get...complicated.
* Heroes (9 pm/ET NBC)
The "Fugitives" volume comes to a close in tonight's season finale. Things aren't looking so great for Danko after he plunged a knife into Sylar's head, only to have the shape-shifting baddie pop up and complain that it merely hurt. Uh-oh. Nathan, meanwhile, must find a way to escape in order to stop Sylar from meeting with the president. Elsewhere, Hiro and Ando's quest to take down Building 26 faces a new roadblock as Hiro's strange illness progresses.
* 24 (9 pm/ET Fox)
Last week's episode made it official: FBI agent Larry Moss is really dead, thanks to Tony Almeida, who has now joined a long list of 24 turncoats. Tony's partner in crime, Galvez, was able to sneak a canister of the bioweapon out of Starkwood, so the pathogen crisis continues. And even though Jack's condition is worsening, he soldiers on and manages to interrogate a key suspect.
* Wow! Wow! Wubbzy! (10 am/ET Nickelodeon)
With a wink to her Destiny's Child roots, Beyonce voices the character of Shine, the lead singer of the Wubb Girlz. The popular group is in town to promote a talent contest called Wuzzleburg Idol. (Wonder where they got that name?) Wubbzy, of course, wants to audition, and he's given a very good piece of advice by the Wubb Girlz: Be yourself. Wubbzy follows that advice and it takes him far...so far that his adventures with the Wubb Girlz continue all week in new episodes.
* Two and a Half Men (9 pm/ET CBS)
Melanie Lynskey makes a return appearance when Chelsea sets Alan up on a blind date with her new friend, who just happens to be Charlie's onetime stalker, Rose. As strange as the prospect of a date between Rose and Alan is, it makes one wonder how Rose and Charlie's fiancee just happen to become friends. Coincidence? Hmmm.