Hugh Marlowe as a character Dr. Russell A. Marvin | Hugh Marlowe also starred in the next movies:- "The Day the Earth Stood Still" in a role of Tom Stevens;
- "Birdman of Alcatraz" in a role of Roy Comstock;
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Joan Taylor as a character Carol Marvin | Joan Taylor also starred in the next movies:- "20 Million Miles to Earth" in a role of Marisa Leonardo;
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Donald Curtis as a character Maj. Huglin, Liason Officer | Donald Curtis also starred in the next movies:- "All That Heaven Allows" in a role of Howard Hoffer;
- "It Came from Beneath the Sea" in a role of Dr. John Carter;
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Morris Ankrum as a character Brig. Gen. John Hanley | Morris Ankrum starred only in the movie "Earth vs. the Flying Saucers" |
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John Zaremba as a character Prof. Kanter | John Zaremba also starred in the next movies:- "20 Million Miles to Earth" in a role of Dr. Judson Uhl;
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Thomas Browne Henry as a character Vice Adm. Enright | Thomas Browne Henry also starred in the next movies:- "Behind Locked Doors" in a role of Dr. Clifford Porter;
- "20 Million Miles to Earth" in a role of Maj. Gen. A.D. McIntosh;
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Grandon Rhodes as a character Gen. Edmunds | Grandon Rhodes also starred in the next movies:- "Revenge of the Creature" in a role of Jackson Foster;
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Larry J. Blake as a character Motorcycle cop | Larry J. Blake also starred in the next movies:- "Herbie Rides Again";
- "Demon Seed" in a role of Cameron;
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Fred Aldrich as a character Man in Saucer Attack | Fred Aldrich also starred in the next movies:- "The Beast from 20,000 Fathoms" in a role of Radio Operator;
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Holly Bane as a character Bit Role | Holly Bane also starred in the next movies:- "The Day the Earth Stood Still" in a role of Army Captain;
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Nicky Blair as a character Military Officer at Experiment | Nicky Blair starred only in the movie "Earth vs. the Flying Saucers" |
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Charles Evans as a character Dr. Alberts | Charles Evans also starred in the next movies:- "The Dark Mirror" in a role of Dist. Atty. Girard;
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Paul Frees as a character Alien | Paul Frees also starred in the next movies:- "Suddenly" in a role of Benny Conklin, Baron's Accomplice (also uncredited TV announcer voice);
- "Flight from Ashiya" in a role of Narrator;
- "The Last Unicorn" in a role of Mabruk;
- "The Hobbit" in a role of Troll #1;
- "The Return of the King" in a role of Lord Elrond;
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