理查德·德莱福斯

Richard Dreyfuss

饰：诺伊·尼尔瑞 Roy Neary

弗朗索瓦·特吕弗

François Truffaut（法）

饰：Claude Lacombe (as Francois Truffaut)

特瑞·加尔

Teri Garr

饰：Ronnie Neary

梅林达·狄龙

Melinda Dillon

饰：Jillian Guiler

鲍勃·巴拉班

Robert Elmer Balaban

饰：David Laughlin

J·帕特里克·麦克纳马拉

J. Patrick McNamara

饰：Project Leader

沃伦·肯梅灵

Warren J. Kemmerling

饰：Wild Bill (as Warren Kemmerling)

罗伯茨·布洛瑟姆

Roberts Blossom

饰：Farmer

兰斯·亨利克森

Lance Henriksen

饰：Robert

麦瑞尔·康纳利

Merrill Connally

饰：Team Leader

乔治·第桑佐

George DiCenzo

饰：Major Benchley

Alexander Lockwood

饰：Implantee

格涅·戴纳斯基

Gene Dynarski

饰：Ike

诺曼·巴托德

Norman Bartold

饰：Ohio Tolls

约瑟夫·索默

Josef Sommer

饰：Larry Butler

Roger Ernest

饰：Highway Patrolman

卡尔·韦瑟斯

Carl Weathers

饰：Military Policeman

F.J. O'Neil

F.J. O'Neil

饰：ARP Project Member

马修·罗宾斯

Matthew Robbins

饰：Returnee #3 Flt. 19

Richard L. Hawkins

饰：Air Traffic Controller

Craig Shreeve

饰：Air Traffic

Bill Thurman

饰：Air Traffic

Gene Rader

饰：Hawker

Daniel Núñez

Daniel Núñez

饰：Federale (as Daniel Nunez)

Luis Contreras

饰：Federale

詹姆斯·基恩

James Keane

饰：Radio Telescope Team

Dennis McMullen

Dennis McMullen

饰：Radio Telescope Team

约翰·丹尼斯·约翰斯顿

John Dennis Johnston

饰：Special Forces

罗伯特·布罗伊尔斯

Robert Broyles

饰：Dirty Tricks #3

Kirk Raymond

Kirk Raymond

饰：Dirty Tricks #4

Basil Hoffman

饰：Longly (uncredited)

Monty Jordan

Monty Jordan

饰：Special Forces Commander,Helicopter Pilot (uncredited)

霍华德·K·史密斯

Howard K. Smith

饰：Howard K. Smith (uncredited)

Bob Westmoreland

饰：Load Dispatcher

Matt Emery

Matt Emery

饰：Support Leader

Galen Thompson

饰：Special Forces

John Ewing

饰：Dirty Tricks #1

Keith Atkinson

Keith Atkinson

饰：Dirty Tricks #2

老本内特·韦恩·迪恩

Bennett Wayne Dean Sr.

饰：Scientist (uncredited)

J. Allen Hynek

饰：Himself - Smoking Pipe at Landing Site (uncredited)

Stephen Powers

Stephen Powers

饰：UN Observer (uncredited)

Shawn Bishop

饰：Brad Neary

Adrienne Campbell

饰：Silvia Neary

Justin Dreyfuss

饰：Toby Neary

Amy Douglass

饰：Implantee

Mary Gafrey

饰：Mrs. Harris

Rev. Michael J. Dyer

饰：Himself (as Rev. Michael J. Dyer)

Phil Dodds

饰：ARP Musician

Randy Hermann

饰：Returnee #1 Flt. 19

哈尔·巴伍德

Hal Barwood

饰：Returnee #2 Flt. 19

David Anderson

饰：Air Traffic Controller

Roy E. Richards

饰：Air East Pilot

Eumenio Blanco

饰：Federale

Chuy Franco

饰：Federale

Cy Young

饰：Radio Telescope Team

Tom Howard

Tom Howard

饰：Radio Telescope Team

Richard Stuart

饰：Truck Dispatcher

菲利普·多德斯

Philip Dodds

饰：Jean Claude

卡里·加菲

Cary Guffey

饰：Barry Guiler