- Rhodes Reason
- Commander Carl Nelson
- Mie Hama
- Madame Piranha (Madame X)
- Linda Miller
- Lieutenant Susan Watson
- Akira Takarada
- Lt. Commander Jiro Nomura
- Hideyo Amamoto
- Dr. Who
- Yoshifumi Tajima
- Henchman
- Sachio Sakai
- Henchman
- Susumu Kurobe
- Henchman
- Nadao Kirino
- Henchman
- Tôru Ibuki
- Henchman
- Kazuo Suzuki
- Henchman
- Ryûji Kita
- SDF General
- Yasuhisa Tsutsumi
- Soldier
- Ikio Sawamura
- Mondo Islander
- Tadashi Okabe
- Soldier
- Osman Yusuf
- Submariner
- Andrew Hughes
- United Nations Reporter
- Shôichi Hirose
- Henchman
- Naoya Kusakawa
- Henchman
- Seishirô Kuno
- Soldier
- Akio Kusama
- Security at Headquarters
- David de Keyser
- (voice)
- Shigeo Katô
- Transport Ship Sailor
- Paul Frees
- Dr. Who
- Julie Bennett
- Females
- Haruo Nakajima
- Kingukongu (King Kong)
- Yû Sekita
- Mekanikongu / Gorosaurusu
- Kazuo Hinata
- Headquarters Security
- Yoshio Katsube
- Dr. Who's minion
- Keiichirô Katsumoto
- Onlooker
- Eisaburo Komatsu
- Doctor Who Henchman / Explorer Crew Member
- King Kong
- King Kong
- Al Kramer
- United Nations Newspaper Reporter
- Haruya Sakamoto
- Self Defense Force Personnel
- Kôichi Satô
- Explorer Crew Member
- Masaaki Tachibana
- Self Defense Force Member
- Kathy Horan
- United Nations Reporter
