Invasion of Astro-Monster (1965)

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Credits for Invasion of Astro-Monster
Invasion of Astro-Monster soundtrack

Godzilla Films
Ghidorah, the Three-Headed Monster
Invasion of Astro-Monster
Ebirah, Horror of the Deep
Toho Company, Limited Monster Movie
The Japanese poster for Invasion of Astro-Monster
Invasion of Astro-Monster
Alternate Titles
Flagicon Japan.png Great Monster War (1965)
Flagicon United States.png Monster Zero (1970)
See alternate titles
Directed by Ishiro Honda
Produced by Tomoyuki Tanaka,
Henry G. Saperstein,
Reuben Bercovitch
Written by Shinichi Sekizawa
Music by Akira Ifukube
Distributor TohoJP
Maron FilmsUS
Rating GUS
Budget ¥???,???,???
Box Office ¥187,550,000[1]
Running Time 94 minutesJP
(1 hour, 34 minutes)
92 minutesUS
(1 hour, 32 minutes)
Designs Used DaisensoGoji, SanDaikaijuRado, ShodaiGhido
Rate this film!
(33 votes)

Ruler of the universe Planet X, Godzilla, Rodan, King Ghidorah's great fierce fight! (宇宙の帝王X星をゆるがすゴジラ・ラドン・キングギドラの大激闘!) „ 

— Tagline

Invasion of Astro-Monster (怪獣大戦争,   Kaijū Daisensō?, lit. Great Monster War) is a 1965 tokusatsu kaiju film produced by Toho and UPA, and the sixth installment in the Godzilla series as well as the Showa series. The film was released to Japanese theaters on December 19, 1965.[2]


During a manned mission to the newly-discovered Planet X located beyond Jupiter in the year 196X, the astronauts Glenn and Fuji encounter inhabitants called Xiliens who ask to borrow the two Earth-bound Monsters Zero-One (Godzilla) and Zero-Two (Rodan) to combat their own terror, Monster Zero.

At the outset of the movie, the two-man spacecraft, crewed by one Japanese and one American (Fuji and Glenn), is approaching Jupiter to visit the newly-discovered "Planet X", which inexplicably maintains a position directly behind Jupiter. The planet is rather dark, but still lit up enough to be visible and for it to be possible to navigate its surface. The spacecraft lands, and the astronauts disembark.

One astronaut vanishes, and the other wonders where he, and the spacecraft, have gone, and then a flat voice intones to him, instructing him where to go. The astronauts are led through subterranean corridors to the office of the Controller of Planet X.

The spacecraft is safe, he assures them, and indicates that they are about to be attacked. The astronauts recognize the attacking creature, King Ghidorah. After a brief black-out, when the astronauts are cut off from being able to see and hear the Controller, they are assured that the monster, known as Monster Zero, has left.

The Controller says that they want Earth's help: to be allowed to capture Monsters Zero One and Zero Two, known to Earthmen as Godzilla and Rodan. In return, Planet X will gift humanity with a wonder drug that cures all diseases. The astronauts agree to return to Earth with the proposal. As they lift off, they say on the radio to the Controller, "We're glad we found friends on Planet X."

Meanwhile, Fuji's sister has a boyfriend, Tetsuo, who's invented a personal alarm he thinks women could use to summon assistance if they're endangered. It creates a horrific loud noise that can be heard blocks away, and wonders why nobody's interested in buying it, but then a Miss Namikawa comes and makes an offer to buy it as an educational device, but keeps putting Tetsuo off on completing the deal.

Fuji and Glenn arrive home, and tell their superiors of the offer by Planet X. Scientists begin searching for Godzilla and Rodan. Then, the Controller of Planet X makes mysterious appearances on Earth, and Glenn becomes suspicious about Planet X. The Controller finally makes his appearance overt, "apologizes" for his unannounced presence, and offers to help locate the two monsters. Two Planet X spacecraft rapidly fly off and extract the two monsters.

Glenn, Fuji and one of their superiors are invited aboard a spacecraft to accompany the Controller back to Planet X, a trip that takes only a few hours; the Controller says that soon they'll be able to travel as fast as light. On reaching Planet X, there is almost immediately an attack by King Ghidorah, and the two from Earth are released to battle it. King Ghidorah is driven off, Godzilla dances a victory jig, and the Controller exults about that. He presents a box that, he says, contains information about the miracle drug, and presents the three men with a faithful duplicate of their spaceship so they can fly home.

On arrival, the box is taken to a special international meeting and is opened to find a reel-to-reel tape. It is loaded onto a machine and set up to play. When the speakers remain silent for a long period, some wonder if the systems are compatible, but others say their system is exactly the same as ours. Finally, there is a beep, and the voice begins. "This is the Controller of Planet X. You will listen to my instructions..." It is an ultimatum to surrender to Planet X.

The aliens arrive, destroy the spacecraft, and threaten to release the three creatures, which are now all under Planet X's control. In a show of confidence, the aliens even betray the method of control: magnetic waves. The Earth scientists realize that they could exploit this information, and work rapidly to find a way to disrupt those magnetic waves, while in the meantime, Earth's armies fight nearly in futility with conventional weapons as the monsters wage most of their destruction against Japan.

Tetsuo, meanwhile, is dissatisfied with the lack of progress on his device, and his inability to get Miss Namikawa to tell him what's happening. He gets imprisoned by the Planet X soldiers. When Glenn, who was infatuated with Miss Namikawa, is also arrested after finding out something about her - she's from Planet X and all their women are virtually identical, he and Tetsuo put clues together. Namikawa gave Glenn, before she was disintegrated by a Planet X soldier, a letter, and in it she says that one simple sound will destroy the people of Planet X. It is the sound made by Tetsuo's "lady beware alarm". He still has the prototype, takes it out and sets it off. It upsets and paralyzes the Planet X soldiers and Glenn can immobilize them and they escape.

They reach the space center scientists and explain about the device. Arrangements are made to broadcast it on all radio and television stations, a tactic that will be employed when the magnetic disruption devices are deployed.

The three monsters are removed from Planet X control, as Planet X spacecraft explode and personnel escape the noise by blowing up ships. Planet X withdraws its attempts to conquer Earth. Meanwhile, Godzilla attacks King Ghidorah with the aid of Rodan, forcing King Ghidorah into a retreat.

Glenn and Fuji are to be sent to Planet X again as ambassadors to seek peaceful relations.


Staff role on the left, staff member's name on the right.


Actor's name on the left, character played on the right.



Weapons, Vehicles, and Races


Main article: Invasion of Astro-Monster/Gallery.


Main article: Invasion of Astro-Monster (Soundtrack).

Alternate Titles

  • Great Monster War (Literal Japanese Title)
  • Great Monster War: King Ghidorah vs. Godzilla (怪獣大戦争 キングギドラ対ゴジラ?, Kaijū Daisensō: Kingu Gidora tai Gojira; Japan Re-Release Title)
  • Monster Zero (United States)
  • Invasion of the Astros (United States)
  • Godzilla vs. Monster Zero (Initial United States Home Video Title)
  • Godzilla vs. the Three-Headed Dragon (Thailand)
  • Invasion Planet "X" (Invasion Planet 'X'; France; French Belgium; Invasion Planeet X; Dutch Belgium)
  • The Monsters Invade the Earth (Los monstruos invaden la tierra; Spain)
  • Monsters of the Galaxies (Monstruos de las galaxias; Mexico)
  • Command from the Dark (Befel aus dem Dunkel; Germany)
  • The Invasion of the Astro Monsters (La invasion de los Astro-Monstruos; Mexico; L'invasione degli Astro Mostri; Italy)
  • Year 2000: The Invasion of the Astro Monsters (Anno 2000: L'invasione degli Astro Mostri; Italy)
  • The Space Monsters Are Attacking (Avaruushirviöt hyökkäävät; Finland)
  • Monster Invasion (Inwazja potworow; Poland)
  • Monsters Coming from Space (Uzaydan canavar geliyor; Turkey)
  • Attack from the Unknown (Utok z neznama; Czechoslovakia)
  • Invasion from Space (Invazija iz svemira; Yugoslavia)
  • War of the Monsters (A Guerra dos Monstros; Brazil)

Theatrical Releases

View all posters for the film here.

  • Japan - December 19, 1965[2]   [view poster]Japanese 1965 poster; March 17, 1971 (Re-Release)   [view poster]Japanese 1971 poster
  • United States - 1970   [view poster]American poster
  • Spain - 1965
  • Italy - 1965   [view poster]Italian poster
  • France - 1967   [view poster]French poster
  • Germany - 1967   [view poster]German poster
  • Poland - 1970   [view poster]Polish poster
  • Finland - 1973
  • Belgium   [view poster]Belgian poster
  • Turkey   [view poster]Turkish poster
  • Colombia   [view poster]Colombian poster
  • Mexico   [view poster]Mexican poster
  • Brazil   [view poster]Brazilian poster
  • Thailand   [view poster]Thai poster
  • Czechoslovakia (Czech Republic)   [view poster]Czech poster
  • Yugoslavia   [view poster]Yugoslav poster

U.S. Release

American War of the Gargantuas and Monster Zero double bill poster

Invasion of Astro-Monster was released in North America by UPA and distributed by Maron Films in 1970 under the title Monster Zero. English dubbing was provided by Glen Glenn Sound. Ironically, since Nick Adams delivered his lines in English on the set, Glenn was the only character whose voice was not dubbed over. Monster Zero played on a double bill with War of the Gargantuas. There were several alterations made:

  • Dialogue was dubbed to English.
  • The title song was changed, and some of Akira Ifukube's score was re-arranged.
  • Several sound effects were added.
  • Deleted: several shots of Godzilla's foot stepping on houses and huts.
  • Deleted: some short shots of the Xilien UFOs.
  • Deleted: Rodan blowing away tanks from the top of a hill.
  • Deleted: a scene of the Controller of Planet X speaking in the language of Planet X.

The American version runs 93 minutes, three minutes shorter than the Japanese version. In his book Japan's Favorite Mon-Star: An Unauthorized History of 'The Big G', Steve Ryfle says "The respectful to the original Japanese version."

Box Office

When Invasion of Astro-Monster was first released on December 19, 1965, it received an attendance of 3,780,000. On its March 17, 1971 re-issue, it sold 1,350,000 tickets, adding up to a rough total of 5,130,000 attendees.

When the film was released in the U.S. in 1970, double-billed with War of the Gargantuas, it gained $3,000,000.


Invasion of Astro-Monster is very popular among fans, often dubbed a classic due to its extraordinary sci-fi story, special effects, plot, and cast.

DVD and Blu-ray Releases

Simitar DVD (1998)[3]

  • Region: N/A
  • Discs: 1
  • Audio: English (2.0 Mono and 5.1 Surround)
  • Subtitles: None
  • Special Features: Optional 1.33:1 presentation (cropped), Simitar-produced trailers for the company's kaiju releases, art gallery, trivia game
  • Notes: Out of print.

Toho DVD (2003)

  • Region: 2
  • Discs: 1
  • Audio: Japanese (2.0 and 5.1)
  • Subtitles: Japanese
  • Special Features: Audio commentary by Yoshio Tsuchiya, theatrical trailer, interactive storybook, 8mm version of the film (5 minutes)

Madman DVD (2005)

  • Region: 4
  • Discs: 1
  • Audio: Japanese (Dolby Digital 2.0 Dual Mono and 5.1)
  • Subtitles: English
  • Special Features: Poster gallery, Japanese trailer, Madman-made trailers

Classic Media DVD (2007)[4]

  • Region: 1
  • Discs: 1
  • Audio: Japanese (2.0 Mono), English (2.0 Mono)
  • Subtitles: English
  • Special Features: Audio commentary for Monster Zero by Stuart Galbraith IV, Tomoyuki Tanaka featurette (8 minutes), poster slideshow
  • Notes: Read the details of the U.S. version's reconstruction here.



1971 Japanese Invasion of Astro-Monster trailer
Turkish Invasion of Astro-Monster trailer
German Invasion of Astro-Monster trailer
American Monster Zero and War of the Gargantuas trailer
American Godzilla vs. Monster Zero trailer


  • This film marks the very first appearance of an alien race in a Godzilla film.
  • Invasion of Astro-Monster is the first Godzilla film to use extensive stock footage during action scenes, recycling shots from Rodan, The Mysterians, and Mothra during the Xilien-directed rampages of Godzilla, Rodan, and King Ghidorah.
  • An updated version of the "Frigate March" from the soundtrack for the original Godzilla film is heard multiple times in this film, including during the opening credits and the scene where the Xiliens' mind control is broken.
  • Godzilla's victory dance from this film appears as an unlockable attack in Bandai Namco's Godzilla that can be used by Godzilla, Godzilla 1964, and Burning Godzilla.
  • The kiss between Miss Namikawa and Glenn in this film is the first and only onscreen kiss in a Toho Godzilla film.
  • Invasion of Astro-Monster was the first Godzilla film Toho co-produced with an American studio.

External Links


This is a list of references for Invasion of Astro-Monster. These citations are used to identify the reliable sources on which this article is based. These references appear inside articles in the form of superscript numbers, which look like this: [1]

Era Icon - Toho.png
Era Icon - Showa.png
Era Icon - Godzilla.png
Era Icon - Rodan.png
Era Icon - King Ghidorah.png


Showing 3 comments. Remember to follow the civility guidelines when commenting.

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15 days ago
Score 0

I watched Invasion of Astro-Monster

I thought it was kind of above average. It wasn't bad at all but it wasn't great or anything. The characters were fine... Miss Namikawa/Glen thing was a little bit cool though I guess? The acting didn't stand out really. Not a lot of monster action at all. The plot is passable. Really silly that the Xiliens would just be taken down by a friggin sound. Yeah, ok. Godzilla happy moment was kawaii though.

🏯🏯🏯 (3/5 japanese castles)


one month ago
Score 0
just watched it and it seemed that during the Glenn/Namikawa kiss, she slips something into his coat pocket. I thought it was the piece of paper he finds in the cell.

Toa Hydros

9 months ago
Score 1

My Thoughts: Invasion of Astro-Monster

For a long time I preferred the previous film, Ghidorah: the Three-Headed Monster, over this one. With subsequent viewings, however, I find that I actually like this one a bit more.

The main reason is the human characters. While the characters from Ghidorah were decent enough, I never really became engaged enough to particularly care about them, instead merely tolerating them until the monster action started again. Here, I find the human/alien characters genuinely likable in their own ways. I especially like the lead alien; his English dub actor has a cool voice.

Sadly, the presence of likable human characters alone does not a Godzilla movie make. The monster action, while still decent by Showa era standards, isn't on par with the fights and rampages seen in the previous films. If this movie had the monster action of Ghidorah the Three-Headed Monster as well as the human characterization, it would've been a much stronger story. As is, it is still worth a watch.