On screen
Cast
119 credited performers
Richard Basehart
Adm. Harriman Nelson
David Hedison
Captain Crane
Terry Becker
Chief Sharkey
Richard Bull
Doctor
Del Monroe
Kowalski (uncredited)
Robert Dowdell
Lt. Comdr. Chip Morton
Paul Trinka
Patterson (uncredited)
Marco López
Crew member with fire extinguisher (uncredited)
Arch Whiting
Sparks (uncredited)
Henry Kulky
Chief Curley Jones
Ted Jordan
Burns (uncredited)
Michael Ansara
Malinoff
Mark Slade
Malone
Alfred Shelly
Chairman (uncredited)
James Doohan
Presidential Assistant
Françoise Ruggieri
Brenda
Peter Mark Richman
John Hendrix
Linda Cristal
Character not listed
Nick Adams
Character not listed
Charles McGraw
Character not listed
Leslie Nielsen
Character not listed
Victor Buono
Tabor Ulrich
John Cassavetes
Character not listed
Yvonne Craig
Character not listed
Adam Williams
Chief
Al Ruscio
Character not listed
Les Tremayne
Character not listed
Danica D'Hondt
Lola Hale
Diane Webber
Mermaid
Douglas Bank
Witt
Judy Lang
Angie
Barbara Bouchet
Tippy Penfield
Regis Toomey
George Penfield
Cyril Delevanti
Noah Grafton
Charles Dierkop
Left-Handed Man
Michael Barrier
Cabrillo
Ted de Corsia
Foreign General
Herbert Lytton
First Admiral
Brooke Bundy
Gundi
Nicholas Colasanto
Reporter (uncredited)
Lloyd Bochner
Martin Davis
Edgar Bergen
Kenner
Walter Brooke
Dan Case
Eric Feldary
Deiner
Dayton Lummis
Reinhardt
Roger C. Carmel
Admiral Halder
John Gallaudet
Admiral Johnson
David Sheiner
Chandler
Frank Ferguson
Air Force General
Damian O'Flynn
Dr. Thompson
Don Knight
Sven Larsen
Arthur Franz
Archer
Alvy Moore
Hoff
Harold J. Stone
Admiral Jiggs Starke
John Banner
Russian Chairman
Edward Platt
Morgan
Nancy Kovack
Monique
Susan Flannery
Stenographer (uncredited)
Patrick Wayne
Fraser
Nick Dimitri
Alien #2 (uncredited)
Carroll O'Connor
Old John
Peter Adams
Johnson
Richard Carlson
Mattson
Anna-Lisa
Sigrid
Steven Geray
Dalgren
Frank Richards
Hassler
Stan Jones
Anderson
Torben Meyer
Proprietor
Greger Vigen
The Boy
Erik Holland
Gartern
Kort Falkenberg
The Father
Gordon Gilbert
O'Brien
Everett Sloane
Gronski
Paul Carr
Clark
Ford Rainey
U.S. President
Robert Carson
S.A.C. General
James Darren
Omir
Seymour Cassel
Jensen
Paul Fix
Sam Burke
Hurd Hatfield
Leopold Zeraff
John Alderson
Round-Face
Peter Brocco
Xanthos
Peter Mamakos
Nicolas
Joseph Walsh
Atlas
Viveca Lindfors
Laura
John Hoyt
General Beeker
Malcolm Atterbury
Commander Jamison
David Lewis
Dr. Kranz
Berry Kroeger
Chairman
Vincent Price
Professor Multiple
George Takei
Cheng
Troy Melton
Alien (uncredited)
Kevin Hagen
Komal
Audrey Dalton
Lydia Parrish
Robert F. Simon
President
Charles Aidman
Dr. Hollis
Eddie Albert
Dr. Fred Wilson
Chuck Courtney
Crew Member (uncredited)
Buck Kartalian
Crew Member (uncredited)
Werner Klemperer
Dr. Gamma (uncredited)
Walter Reed
Scientist (uncredited)
Henry Jones
Dr. Sprague
Tyler McVey
Gen. Blake (uncredited)
Jim Mills
Shadowman (voice) (uncredited)
Phillip Barry
Crew Member (uncredited)
Paul Carr
Clark (uncredited)
Ron Stein
Crew Member (uncredited)
Malachi Throne
General Gamal
Mario Alcalde
Major Amadi
Jacques Aubuchon
Abdul Azziz
Joseph Ruskin
Inspector Falazir
Wayne Heffley
Seaview Doctor (uncredited)
Michael Constantine
Dr. Brand
Torin Thatcher
MacDougall
Hedley Mattingly
Lester
George Mitchell
Angus
John McLiam
Andrews
Joe Higgins
Magistrate
Tudor Owen
Crofter