Official website: http://disney.go.com/disneyvideos/liveaction/underdog/
Jason Lee
Shoeshine / Underdog (voice)
Jim Belushi
Dan Unger
Patrick Warburton
Cad
John Slattery
Mayor
Peter Dinklage
Dr. Simon Barsinister
Brad Garrett
Riff Raff (voice)
Taylor Momsen
Molly
Amy Adams
Polly Purebred (voice)
Alex Neuberger
Jack Unger
Larry Vigus
Security Guard