Dancing with the Stars (8pm, ABC) - The new cast is introduced tonight, along with their professional partners. The eleven couples perform either the Viennese Waltz or the cha-cha. That's Kate Gosselin on the left. Is she wearing a wig?
Chuck (8pm, NBC) - Chuck's future as a spy rests on one final test mission in which he's called upon to terminate his target.
How I Met Your Mother (8pm, CBS) - Ted wrecks Lily's birthday party by bringing the heiress to the Massengill fortune along as his date. That's right, Laura Prepon guest stars.
Law & Order (10pm, NBC) - Four cops are shot and by the time the case gets to trial, the police force is pitted against the prosecution.
Castle (10pm, ABC) - In part one of a two-parter, Beckett and Castle work with a federal agent to track down a crafty serial killer. Dana Delaney guest stars, making it reunion time with her "Desperate Housewives" husband Nathan Fillion (remember how they wasted him on that show??).