Glenn Ford

Character: President Richardson

Robert Vaughn

Character: Senator Barkley

Masao Kusakari

Character: Doctor Shûzô Yoshizumi

Yumi Takigawa

Character: Asami Noriko

Henry Silva

Character: General Garland

Bo Svenson

Character: Major Carter

Stephanie Faulkner

Character: Sarah Baker

Stuart Gillard

Character: Doctor Ed Meyer

Cec Linder

Character: Doctor Latour

Chuck Connors

Character: Captain McCloud - HMS Nereid

George Kennedy

Character: Admiral Conway

Olivia Hussey

Character: Marit

Edward James Olmos

Character: Captain Lopez

Isao Natsuyagi

Character: Commander Nakanishi

Julie Khaner

Character: Secretary - Palmer Station

George Touliatos

Character: Col. Rankin

Sonny Chiba

Character: Dr. Yamauchi

Tsunehiko Watase

Character: Yasuo Tatsuno

Kensaku Morita

Character: Ryûji Sanazawa

Toshiyuki Nagashima

Character: Akimasa Matsuo

Nicholas Campbell

Character: Radio Operator - Palmer Station

Chris Wiggins

Character: Dr. Borodinov

Eve Crawford

Character: Dr. Irma Ollich

John Bayliss

Character: Major King

John Rutter

Character: Sailor #1 - HMS Nereid

Alf Humphreys

Character: Sailor #2 - HMS Nereid

Michael Tough

Character: Young Sailor - HMS Nereid

Ken Ogata

Character: Prof. Tsuchiya

William Binney

Character: White House Aide Simmons

Stuart Gillard

Character: Dr. Ed Meyer

Colin Fox

Character: Spy Z

Ken Pogue

Character: Dr. Krause

Alberta Watson

Character: Litha (uncredited)

Danielle Schneider

Character: Secretary - Palmer Station

Mitsuko Oka

Character: Tatsuno Yoshiko

Takashi Noguchi

Character: Doctor's Assistant

Nenji Kobayashi

Character: Doctor's Assistant #2

Haruki Kadokawa

Character: Crew Member

Chū Takatsuki

Character: Crew Member

Takeshige Hatanaka

Character: Crew Member

Chikara Gonoue

Character: Crew Member

Danielle Schneider

Character: American Antarctic Crew Member