Schoolhouse Rock! 50th Anniversary Singalong

Ryan Seacrest

Self

Julianne Hough

Self

Kal Penn

Self

Jason Biggs

Self

Shaquille O'Neal

Self

Derek Hough

Self

Ne-Yo

Self

will.i.am

Self

Raven-Symoné

Self

Retta

Self

Jenny Mollen

Self

Kara Lindsay

Self

Kelly Sweeney

Self

Hayley Erbert Hough

Self

Fortune Feimster

Self

Matt Vogel

Kermit (voice)

Eric Jacobson

Fozzie (voice)