Donald O'Connor as Peter Stirling

Yvette Duguay as Maria Scola

Gene Lockhart as Tom Henderson

Nancy Guild as Alberta Ames

William Harrigan as Inspector Hansen

Silvio Minciotti as Salvatore Scola

Lowell Gilmore as Jefferson Garnet

Larry Gates as Dan Austin

Hanley Stafford as Dr. Goodrich

Gale Gordon as Evans

Forrest Lewis as Judge Stanley

Chill Wills as Francis (voice) (uncredited)

Charles Flynn as Jones