Roy Neary
Claude Lacombe (as Francois Truffaut)
Ronnie Neary
Jillian Guiler
David Laughlin
Project Leader
Wild Bill (as Warren Kemmerling)
Farmer
Jean Claude
Barry Guiler
Brad Neary
Silvia Neary
Toby Neary
Robert
Team Leader
Major Benchley
Implantee
Ike
Mrs. Harris
Ohio Tolls
Larry Butler
Self (as Rev. Michael J. Dyer)
Highway Patrolman
Military Police
ARP Project Member (as F. J. O'Neil)
ARP Musician
Returnee #1 Flt. 19
Returnee #2 Flt. 19
Returnee #3 Flt. 19
Air Traffic Controller
Air Traffic
Air East Pilot
Hawker
Sunburned Old Man
Federale
Mexican Federale
Radio Telescope Team
Truck Dispatcher
Load Dispatcher
Support Leader
Special Forces Soldier
Special Forces
Dirty Tricks #1
Dirty Tricks #2
Dirty Tricks #3
Dirty Tricks #4
Technician (uncredited)
Scientist (uncredited)
Alien (uncredited)
Longly (uncredited)
Self - Smoking Pipe at Landing Site (uncredited)
#1 Alien (uncredited)
Special Forces Commander / Helicopter Pilot (uncredited)
Reporter (uncredited)
Speaking Child (uncredited)
Receptionist (uncredited)
Extra (uncredited)
Agent (uncredited)
UFO watcher at Crescendo Summit (uncredited)
UN Observer (uncredited)
Special Forces Hazmat Soldier (uncredited)
Howard K. Smith (uncredited)