Astronauts Glenn and Fuji investigate Planet X and encounter mysterious aliens known as the Xiliens, who ask Earth's people to help save their world from "Monster Zero". In exchange for borrowing Godzilla and Rodan, the Xiliens offer a cure for cancer. As Glenn investigates, he develops a romance with Miss Namikawa and uncovers the Xilien's true intentions.

Directed by: Ishirō Honda
Written by: Shinichi Sekizawa
Runtime: 96 minutes
Tagline: The great fierce battle between Godzilla, Rodan, and King Ghidorah that will sway the ruler of the Universe, Planet X!
Related titles:
Cast:
Akira Takarada Akira Takarada
Astronaut K. Fuji 
Yoshio Tsuchiya Yoshio Tsuchiya
Controller of Planet X 
Gorō Naya Gorō Naya
Astronaut F. Glenn (voice) 
Nick Adams Nick Adams
Astronaut F. Glenn 
Kumi Mizuno Kumi Mizuno
Miss Namikawa 
Jun Tazaki Jun Tazaki
Dr. Sakurai 
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Also known as:
  • Godzilla 6 - Invasion of Astro-Monster
  • Godzilla vs. Monster Zero
  • Invasion of Astro-Monster
  • Invasion of the Astro-Monsters
  • Invasion of the Astros
  • Monster Zero
  • A Guerra dos Monstros
  • Gidorra - Befehl aus dem Dunkeln
  • Godzilla Goes to Space!
  • Gojira Uchū e Iku!
  • Kaijû daisenso - Kaijû daisenso Kingughidorah tai Gojira
  • Kaijū Daisensō Kingu Gidora tai Gojira
  • Kong Kong 2000
  • L'invasione degli astromostri
  • Los monstruos invaden la Tierra
  • The Great Kaiju War
  • The Great Monster War: King Ghidorah vs. Godzilla
  • Ґодзілла проти Монстра Зеро
  • ゴジラ宇宙へ行く!
  • 怪獣大戦争
  • 怪獣大戦争 キングギドラ対ゴジラ