• 
  Robert Wise

  regizor

• 
  Edmund H. North

  scenarist

• 
  Michael Rennie (I)

  Klaatu
• 
  Patricia Neal

  Helen Benson
• 
  Hugh Marlowe

  Tom Stevens
• 
  Sam Jaffe

  Prof. Jacob Barnhardt
• 
  Billy Gray

  Bobby Benson
• 
  Frances Bavier

  Dna. Barley

• 
  Lock Martin

  Gort
• 
  Charles Sherlock

  Government Man
• 
  Edith Evanson

  Mrs. Crockett
• 
  Carleton Young

  Colonel in Jeep
• 
  Charles Tannen

  Voice of Radio Announcer
• 
  Harlan Warde

  Carlson
• 
  Roy Engel

  Government Man

• 
  Harold Miller

  Military Officer at Pentagon Meeting
• 
  Fay Roope

  Major General
• 
  Kipp Whitman

  Sentry
• 
  John Burton

  British Radio Announcer
• 
  Billy Gray

  Bobby Benson

• 
  Julian Blaustein

  producător
• 
  Addison Hehr

  scenografie
• 
  Leo Tover

  imagine
• 
  William Reynolds

  montaj
• 
  Lyle R. Wheeler

  design de producţie
• 
  Claude E. Carpenter

  decoruri
• 
  Thomas Little

  decoruri
• 
  Harry Bates

  o poveste de