Fred MacMurray as Wilson Daniels

Jean Hagen as Freeda Daniels

Tommy Kirk as Wilby Daniels

Annette Funicello as Allison D'Allessio

Tim Considine as Buzz Miller

Kevin Corcoran as Moochie (Montgomery) Daniels

Cecil Kellaway as Professor Plumcutt

Alexander Scourby as Dr. Mikhail Andrassy

Roberta Shore as Franceska Andrassy

James Westerfield as Officer Hanson

Strother Martin as Thurm

Forrest Lewis as Officer Kelly

Ned Wever as FBI Chief E.P. Hackett

Gordon Jones as Captain Scanlon, Police Chief

Jacques Aubuchon as Stefano

Jack Albertson as Reporter (uncredited)