Donald O'Connor

as Peter Stirling

as Wilbur McMurty

as Cosmo Brown

as Beau Geste (as a Child)

as Specialty dancer

as Buster Keaton

as Specialty Act

as Uncle Cyrus

as Self

as Frankie Flanagan

as Donald Corrigan

as Pat Donahue Jr.

as Self

as Clarence Millard (archive footage) (uncredited)

as Harlow Safford

as George Decova / Barnaby the Great

as Oscar Tilton

as Howard Enicker

as Leo Halbert

as Self - Co-Host

as Barry Barnes

as Fred

as Self - Presenter

as Benjamin Boggs