Shin'ichi Ôzaki
Miyuki Otonashi
Captain Douglas Gordon
Anna Otonashi
The controller of Planet X
Katsunori Kazama
Commander Akiko Namikawa
UN Secretary General Naotarô Daigo
Xilian General
Major Kita
Samon Taguchi
Major Kumoro
Shobijin
Commander Kumasaka
Hachiro Jinguji
Kenta Taguchi
Original Gotengo Deputy Captain
Original Gotengo Commander
Xilian
Female Xilian
Godzilla
Minilla / Rodan
Gigan / Hedorah
Anguirus / Ebirah
Monster X / King Caesar
Glenn
(uncredited)
Narrator (voice)
Newscaster (Ben Riley) (uncredited)