cast
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Richard Dreyfuss
Roy Neary
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François Truffaut
Claude Lacombe
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Teri Garr
Ronnie Neary
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Melinda Dillon
Jillian Guiler
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Bob Balaban
David Laughlin
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J. Patrick McNamara
Project Leader
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Warren J. Kemmerling
Wild Bill
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Roberts Blossom
Farmer
- Phil Dodds ARP Musician
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Cary Guffey
Barry Guiler
- Shawn Bishop Brad Neary
- Adrienne Campbell Sylvia Neary
- Justin Dreyfuss Toby Neary
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Lance Henriksen
Robert
- Merrill Connally Team Leader
- Amy Douglass Implantee
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Gene Dynarski
Ike
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Carl Weathers
Military Policeman
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Norman Bartold
Norman Bartold
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F.J. O'Neil
ARP Project Member
- Hal Barwood Returnee #2 Flt. 19
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Matthew Robbins
Returnee #3 Flt. 19
- Gene Rader Hawker
- Daniel Nunez Federale
- Chuy Franco Federale
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Luis Contreras
Federale
- Galen Thompson Special Forces
- John Dennis Johnston Special Forces
- Robert Broyles Dirty Tricks #3
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George DiCenzo
Major Benchley
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Alexander Lockwood
Implantee
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Josef Sommer
Larry Butler
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Bill Thurman
Air Traffic
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James Keane
Radio Telescope Team
- Philip Dodds Jean Claude
- Mary Gafrey Mrs. Harris
- Michael J. Dyer Himself
- Roger Ernest Highway Patrolman
- Randy Herman Returnee #1 Flt. 19
- David Anderson Air Traffic Controller
- Richard L. Hawkins Air Traffic Controller
- Craig Shreeve Air Traffic
- Roy E. Richards Air East Pilot
- Eumenio Blanco Federale
- Dennis McMullen Radio Telescope Team
- Cy Young Radio Telescope Team
- Tom Howard Radio Telescope Team
- Richard Stuart Truck Dispatcher
- Bob Westmoreland Load Dispatcher
- Matt Emery Support Leader
- John Ewing Dirty Tricks #1
- Kirk Raymond Dirty Tricks #4
- Keith Atkinson Dirty Tricks #2
- Monty Jordan Special Forces Commander / Helicopter Pilot (uncredited)
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Basil Hoffman
Longly (uncredited)
- Stephen Powers UN Observer (uncredited)
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J. Allen Hynek
Man Smoking Pipe at Landing Site (uncredited)
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Howard K. Smith
Howard K. Smith (uncredited)