Season 2

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.

Guest co-host Kathie Lee Gifford; actress Leah Remini; actor Will Arnett; comic Don Barris.

Guest co-host Kathie Lee Gifford; comic Adam Carolla ("The Man Show"); actress Susie Essman; comic Craig Robinson.

Guest co-host Kathie Lee Gifford; singer Kylie Minogue; actor Adam Rodriguez; the Black Eyed Peas perform.

Guest co-host Kathie Lee Gifford; former pro basketball player Magic Johnson; singer Missy Elliott; Buddy Guy performs.

Guest co-host Kathie Lee Gifford; TV host Pat O'Brien; Kenny Chesney performs.

Guest co-host Warren Sapp; comic Jim Florentine; Olympic softball pitcher Jennie Finch; the Fab Four perform.

Guest co-host Warren Sapp; actor Dean Cain; the Bug Brothers Tim and Derek Majewski; Dizzee Rascal performs.

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.