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)