- Tatsuo Umemiya
- Waku-san / Planetary Prince (as Tatsuo Unemiya)
- Hiroko Mine
- Sachiko Shibasaki
- Takashi Kanda
- Inspector Takeda
- Ushio Akashi
- Dr. Maki
- Ken Hasebe
- Newsreporter Tabei
- Junji Masuda
- Colonel Watanabe
- Jôji Oka
- Phantom Ambassador
- Akira Asami
- Ichirô, Dr. Maki's Son
- Rikiya Iwaki
- Phantom Ambassador's Henchman
- Akira Katayama
- Dr. Naitô
- Yûji Kitamine
- Newsreporter
- Kôji Komori
- Makoto, Shoeshine Boy
- Tokio Kozuka
- Tsunoda
- Hajime Kubo
- Newsreporter
- Hiroshi Mihara
- Phantom Ambassador's Henchman
- Tadashi Minamikawa
- Major Munakata
- Kaoru Nakano
- Mrs. Tateishi
- Masahiko Naruse
- Shibasaki
- Junkichi Orimoto
- Colonel Matsuda
- Kôji Sahara
- Sakai
- Shikô Saitô
- Director General of the Defense Agency Fukuhara
- Ken Sawaaki
- Commander Kôda
- Shûsuke Sone
- Dr. Tateishi
- Ken Sudô
- Mukai
- Giichi Sugi
- Newsreporter Tôno
- Akira Tatematsu
- Sawamoto
- Kenji Todoroki
- Phantom Ambassador's Henchman
- Midori Tsuzuki
- Kimiko, Shoeshine Girl
- Rin'ichi Yamamoto
- Detective Kawashima / Giant
- Walker Churchman
- Pilot (American Cut)
