Peter Lind Hayes
August Zabladowski
Mary Healy
Heloise Collins
Hans Conried
Dr. Terwilliker
Tommy Rettig
Bartholomew Collins
Robert Heasley
Uncle Judson
Jack Heasley
Uncle Whitney
Alan Aric
Elevator Operator (uncredited)
Henry Kulky
Stroogo (uncredited)
Tony Butala
Boy Pianist (uncredited)
Kim Charney
Kim - Boy in Line (uncredited)
Luigi Faccuito
Dancer in Dungeon Ballet (uncredited)
Diki Lerner
Dancer in Dungeon Ballet (uncredited)
Harry Wilson
Guard / Doorman (uncredited)