- Don Knotts
- Roy Fleming
- Leslie Nielsen
- Major Fred Gifford
- Joan Freeman
- Ellie Jackson
- Jesse White
- Donelli
- Jeanette Nolan
- Mrs. Fleming
- Frank McGrath
- Plank
- Arthur O'Connell
- Buck Fleming
- Joan Shawlee
- Blonde in Bar
- Guy Raymond
- Bert
- Nydia Westman
- Aunt Zana
- Paul Hartman
- Rush
- Robert F. Simon
- Cervantes
- Robert Pickering
- Moran
- Budd Albright
- Officer
- Thomas Bellin
- Technician
- Marjorie Bennett
- Woman at Mailbox
- Jim Boles
- Bartender
- Paul Bradley
- Engineer
- Loie Bridge
- Frieda Wilcox
- Paul Bryar
- First Bus Driver
- Ceil Cabot
- Waitress
- Bob Carraway
- Bob Friendly
- Al Checco
- Man at Console
- Pat Colby
- Scientist
- John Daheim
- Startled Motorist
- Fabian Dean
- Second Bus Driver
- Fay DeWitt
- Secretary
- Jerry Dexter
- Technician
- Nick Dimitri
- Astronaut
- Jerry Dunphy
- TV Newscaster
- Cecil Elliott
- Roselle Duncan - Woman with Dog
- Pamelyn Ferdin
- Mary - Little Girl
- Mickey Finn
- Charley
- Med Flory
- White Shirt in Bar
- Melissa Gilbert
- Niece
- Harry Holcombe
- Dr. Bowen
- Shep Houghton
- Engineer
- Vince Howard
- Technician
- William Hudson
- Fireman
- Ray Kellogg
- Brown Shirt in Bar
- Dorothy Konrad
- Woman Playing Piano
- Lee Krieger
- Second Janitor
- Ted Mapes
- Hot Dog Vendor
- Pat McCaffrie
- Scotty
- Ralph Montgomery
- First Janitor
- Burt Mustin
- Ned
- Bill Neff
- Minor Role
- Ron Nyman
- Astronaut
- Nelson Olmsted
- Dr. Lowe
- Murray Pollack
- Nasa Employee
- Bill Quinn
- Captain Ferguson
- Anthony Redondo
- Observer on Sidewalk
- Waclaw Rekwart
- Bus Passenger
- Clint Ritchie
- Officer
- Edwin Rochelle
- Bus Passenger
- Don Ross
- Airport Ticket Clerk
- Billy Sands
- Airport Announcer / Man Mopping Floor in Film (uncredited)
- Orville Sherman
- Personnel Clerk
- Norman Stevans
- Engineer
- Jimmy Stiles
- Boy
- Herb Vigran
- Dr. Bussart
- Grant Woods
- Technician
- Gordon Yaeger
- Jet Pack Pilot
