• 
  Eugène Lourié

  regizor

• 
  Ray Bradbury

  scenarist
• 
  Fred Freiberger

  scenarist

• 
  Cecil Kellaway

  Prof. Thurgood Elson
• 
  Lee Van Cleef

  Cpl. Stone
• 
  Paul Hubschmid

  Professor Tom Nesbitt (ca Paul Christian)
• 
  Ray Moyer

  Lee Hunter
• 
  Kenneth Tobey

  Col. Jack Evans

• 
  Donald Woods

  Capt. Phil Jackson
• 
  Bess Flowers

  Ballet-Goer
• 
  Jack Pennick

  Jacob Bowman
• 
  Merv Griffin

  cranic radio
• 
  Steve Brodie

  Sgt. Loomis
• 
  Lee Phelps

  Poliţist
• 
  Paul Picerni (I)

  Announcer in trailer

• 
  Robert Easton

  Deckhand
• 
  Fred Aldrich

  Radio Operator
• 
  Roy Engel

  Maj. Evans
• 
  Joe Gray (I)

  Longshoreman
• 
  Ross Elliott

  George Ritchie
• 
  James Best

  Charlie - Radar man
• 
  Vera Miles

  Announcer in trailer
• 
  Michael Fox

  ER Doctor
• 
  Kenner G. Kemp

  Cop with Rifle
• 
  King Donovan

  Dr. Ingersoll
• 
  Frank Ferguson

  Dr. Morton
• 
  Alvin Greenman

  First Radar Man
• 
  Paula Hill

  Miss Ryan (as Mary Hill)
• 
  Ray Hyke

  Sgt. Willistead
• 
  Paula Raymond

  Lee Hunter