Gene Kelly

Jeremy Keen, the Peddler

Bobby Riha

Jack

Ted Cassidy

The Giant (voice)

Marian McKnight

Jack's Mother

Marni Nixon

Princess Serena (singing voice)

Leo De Lyon

Woggle-Bird (voice)

Cliff Norton

Woggle-Bird (voice)

Janet Waldo

Princess Serena (voice)

Don Messick

Cat / Mice (voice) (uncredited)