Hayley Mills
Patti Randall
Dean Jones
Zeke Kelso
Dorothy Provine
Ingrid Randall
Roddy McDowall
Gregory Benson
Frank Gorshin
Iggy
Neville Brand
Dan
Elsa Lanchester
Mrs. MacDougall
William Demarest
Mr. MacDougall
Richard Eastham
Supervisor Newton
Grayson Hall
Margaret Miller
Tom Lowell
Canoe Henderson
Richard Deacon
Drive-in-Manager
Iris Adrian
Landlady
Liam Sullivan
Graham
Don Dorrell
Spires
Gene Blakely
Cahill
Karl Held
Kelly
Ed Wynn
Mr. Hofstedder
Larry J. Blake
Police Officer (uncredited)
John Cliff
FBI Agent Hart (uncredited)
D.C. Benny
Siamese Cat (uncredited)
Ben Lessy
Drive-In Concessionaire (uncredited)