 Michael Rennie as a character Klaatu | Michael Rennie also starred in the next movies:- "The Robe" in a role of Peter;
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 Patricia Neal as a character Helen Benson | Patricia Neal also starred in the next movies:- "Cookie's Fortune" in a role of Jewel Mae 'Cookie' Orcutt;
- "Breakfast at Tiffany's" in a role of 2-E;
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 Hugh Marlowe as a character Tom Stevens | Hugh Marlowe also starred in the next movies:- "Birdman of Alcatraz" in a role of Roy Comstock;
- "Earth vs. the Flying Saucers" in a role of Dr. Russell A. Marvin;
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 Sam Jaffe as a character Prof. Jacob Barnhardt | Sam Jaffe also starred in the next movies:- "Bedknobs and Broomsticks" in a role of Bookman;
- "Ben-Hur" in a role of Simonides;
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 Billy Gray as a character Bobby Benson | Billy Gray also starred in the next movies:- "Some Like It Hot" in a role of Sig Poliakoff;
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 Frances Bavier as a character Mrs. Barley | Frances Bavier starred only in the movie "The Day the Earth Stood Still" |
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 Lock Martin as a character Gort | Lock Martin starred only in the movie "The Day the Earth Stood Still" |
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 Elmer Davis as a character Himself | Elmer Davis starred only in the movie "The Day the Earth Stood Still" |
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 H.V. Kaltenborn as a character Himself | H.V. Kaltenborn starred only in the movie "The Day the Earth Stood Still" |
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 Drew Pearson as a character Himself | Drew Pearson starred only in the movie "The Day the Earth Stood Still" |
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 Gabriel Heatter as a character Himself | Gabriel Heatter starred only in the movie "The Day the Earth Stood Still" |
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 Holly Bane as a character Army Captain | Holly Bane also starred in the next movies:- "Earth vs. the Flying Saucers" in a role of Bit Role;
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 Marshall Bradford as a character Chief of Staff | Marshall Bradford also starred in the next movies:- "A Summer Place" in a role of Dr. Matthias;
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 John Brown as a character George Barley | John Brown also starred in the next movies:- "Hans Christian Andersen" in a role of Schoolmaster;
- "Maxed Out: Hard Times, Easy Credit and the Era of Predatory Lenders" in a role of Himself;
- "The Wild One" in a role of Bill Hamegan;
- "Running on Empty Dreams" in a role of Church Goer;
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 John Burton as a character British radio MC | John Burton also starred in the next movies:- "The Spider Woman" in a role of Announcer;
- "The Woman in Green" in a role of Waring;
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