American Idol (8pm, Fox) - Casey's dramatic "save" last week means not one but two contestants will be voted off tonight. Is Scotty McCreery safe?? Also, Fantasia, will.i.am, and Jamie Foxx perform live.
The Big Bang Theory (8pm, CBS) - The guys become sleuths to find out who hacked Sheldon's online game account.
Perfect Couples (8:30, NBC) - Vance befriends Amy's exes and ends up worried that he may someday join their ranks. Also, Rex wants a peek at Leigh's ex files. I think there's only one more episode of this show after tonight, which is a real shame.
Grey's Anatomy (9pm, ABC) - It's the episode we've all been dreading. It's 'Grey's Anatomy: The Musical.' I wish I was kidding.
Mobbed (9pm, Fox) - Howie Mandell hosts a show in which unsuspecting people are greeted by flash mobs during special occasions, such as a wedding proposal, a pregnancy, and a hiring.
The Mentalist (10pm, CBS) - A man who believed he had been abducted by aliens at one time is found murdered and his body is stolen from the coroner's van.