Gene Kelly as Jeremy Keen, the Peddler

Bobby Riha as Jack

Ted Cassidy as The Giant (voice)

Marian McKnight as Jack's Mother

Marni Nixon as Princess Serena (singing voice)

Chris Allen as Mouse (voice)

Dick Beals as Jack (singing voice)

Leo De Lyon as Woggle-Bird (voice)

Cliff Norton as Woggle-Bird (voice)

Janet Waldo as Princess Serena (voice)

Don Messick as Cat / Mice (voice) (uncredited)