Glenn Ford

as President Richardson

Robert Vaughn

as Senator Barkley

Masao Kusakari

as Doctor Shûzô Yoshizumi

Yumi Takigawa

as Asami Noriko

Henry Silva

as General Garland

Bo Svenson

as Major Carter

Stephanie Faulkner

as Sarah Baker

Stuart Gillard

as Doctor Ed Meyer

Cec Linder

as Doctor Latour

Chuck Connors

as Captain McCloud - HMS Nereid

George Kennedy

as Admiral Conway

Olivia Hussey

as Marit

Edward James Olmos

as Captain Lopez

Isao Natsuyagi

as Commander Nakanishi

Julie Khaner

as Secretary - Palmer Station

George Touliatos

as Col. Rankin

Sonny Chiba

as Dr. Yamauchi

Tsunehiko Watase

as Yasuo Tatsuno

Kensaku Morita

as Ryûji Sanazawa

Toshiyuki Nagashima

as Akimasa Matsuo

Nicholas Campbell

as Radio Operator - Palmer Station

Chris Wiggins

as Dr. Borodinov

Eve Crawford

as Dr. Irma Ollich

John Bayliss

as Major King

John Rutter

as Sailor #1 - HMS Nereid

Alf Humphreys

as Sailor #2 - HMS Nereid

Michael Tough

as Young Sailor - HMS Nereid

Ken Ogata

as Prof. Tsuchiya

William Binney

as White House Aide Simmons

Stuart Gillard

as Dr. Ed Meyer

Colin Fox

as Spy Z

Ken Pogue

as Dr. Krause

Alberta Watson

as Litha (uncredited)

Danielle Schneider

as Secretary - Palmer Station

Mitsuko Oka

as Tatsuno Yoshiko

Takashi Noguchi

as Doctor's Assistant

Nenji Kobayashi

as Doctor's Assistant #2

Haruki Kadokawa

as Crew Member

Chū Takatsuki

as Crew Member

Takeshige Hatanaka

as Crew Member

Chikara Gonoue

as Crew Member

Danielle Schneider

as American Antarctic Crew Member