cast
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Glenn Ford
President Richardson
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Robert Vaughn
Senator Barkley
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Masao Kusakari
Doctor Shûzô Yoshizumi
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Yumi Takigawa
Asami Noriko
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Henry Silva
General Garland
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Bo Svenson
Major Carter
- Stephanie Faulkner Sarah Baker
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Stuart Gillard
Doctor Ed Meyer
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Cec Linder
Doctor Latour
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Chuck Connors
Captain McCloud - HMS Nereid
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George Kennedy
Admiral Conway
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Olivia Hussey
Marit
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Edward James Olmos
Captain Lopez
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Isao Natsuyagi
Commander Nakanishi
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Julie Khaner
Secretary - Palmer Station
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George Touliatos
Col. Rankin
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Sonny Chiba
Dr. Yamauchi
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Tsunehiko Watase
Yasuo Tatsuno
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Kensaku Morita
Ryûji Sanazawa
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Toshiyuki Nagashima
Akimasa Matsuo
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Nicholas Campbell
Radio Operator - Palmer Station
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Chris Wiggins
Dr. Borodinov
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Eve Crawford
Dr. Irma Ollich
- John Bayliss Major King
- John Rutter Sailor #1 - HMS Nereid
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Alf Humphreys
Sailor #2 - HMS Nereid
- Michael Tough Young Sailor - HMS Nereid
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Ken Ogata
Prof. Tsuchiya
- William Binney White House Aide Simmons
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Stuart Gillard
Dr. Ed Meyer
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Colin Fox
Spy Z
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Ken Pogue
Dr. Krause
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Alberta Watson
Litha (uncredited)
- Danielle Schneider Secretary - Palmer Station
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Mitsuko Oka
Tatsuno Yoshiko
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Takashi Noguchi
Doctor's Assistant
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Nenji Kobayashi
Doctor's Assistant #2
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Haruki Kadokawa
Crew Member
- Chū Takatsuki Crew Member
- Takeshige Hatanaka Crew Member
- Chikara Gonoue Crew Member
- Danielle Schneider American Antarctic Crew Member