Mister Big

Donald O'Connor

as Donald J. O'Connor

Gloria Jean

as Patricia Davis

Peggy Ryan

as Peggy

Robert Paige

as Johnny Hanley

Elyse Knox

as Alice Taswell

Samuel S. Hinds

as Jeremy Taswell

Robert Scheerer

as Bobby (as Bobby Scheerer)

Richard Stewart

as Genius

Elinor Donahue

as Muggsy

Florence Bates

as Mrs. Mary Davis

Ray Eberle

as Ray Eberle

Eddie Miller

as Leader, Eddie Miller's Bob Cats

Ben Carter

as Ben Carter - Choir Leader

Irving Bacon

as Jimmy, Malt Shop Proprietor

William Ruhl

as Producer

Alan Ward

as Producer

Jimmie Lucas

as Gardener

Lassie Lou Ahern

as Dancer (uncredited)

Dorothy Babb

as 'Jivin' Jacks and Jills' Member (uncredited)

Bobby Brooks

as Specialty Act (uncredited)

Roland Dupree

as 'Jivin' Jacks and Jills' Member (uncredited)

Bess Flowers

as Theatrical Party Member (uncredited)

Karen X. Gaylord

as Theatrical Party Member (uncredited)

Jean Inness

as Theatrical Party Member (uncredited)

Charles Marsh

as Theatrical Producer (uncredited)

Shirley Mills

as 'Jivin' Jacks and Jills' Member (uncredited)

Bert Moorhouse

as Theatrical Producer (uncredited)

Patsy O'Connor

as Genius' Dancing Partner (uncredited)

Tommy Rall

as 'Jivin' Jacks and Jills' Member (uncredited)

Emmett Vogan

as Theatrical Party Member (uncredited)

Claire Whitney

as Theatrical Party Member (uncredited)