Guest co-host Fred Willard; actress Jennifer Beals; boxer Randy Couture; Jonny Lang performs.

Guest co-host Fred Willard; TV personality Keshia Knight Pulliam ("Celebrity Mole Yucatan"); comic Tony Camin.

Guest co-host Fred Willard; actor Hank Azaria; NASCAR driver Michael Waltrip; competitive eater Sonya Thomas.

Guest co-host Fred Willard; journalist John Stossel; former NFL player Lawrence Taylor; Coheed and Cambria perform.

Guest co-host Fred Willard; musician Nick Lachey; pro football player Warren Sapp; Shelby Lynne performs; Jimmy Kimmel broadcasts from a Houston family's home in anticipation of the Super Bowl.

Actor Billy Bob Thornton; actor Dominic Monaghan; pitcher Pedro Martinez's lucky charm, Nelson de la Rosa.

Model Brooke Burke; Tears for Fears performs.

Actor/comic Patton Oswalt; Bowling for Soup performs.

Actor Blair Underwood; actress Virginia Madsen; Interpol performs.

Actor Adam Brody; TV personality Ben Stein.

Actor Robin Williams; Guerilla Black performs.