Invasion of Astro-Monster (1965)

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Image gallery for Invasion of Astro-Monster
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 ¥132,000,000[1]
Box Office ¥210,000,000[1]
Running Time 94 minutesJP
(1 hour, 34 minutes)
92 minutesUS
(1 hour, 32 minutes)
Aspect Ratio 2.35:1
Rate this film!
(72 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!)

— Japanese tagline

It went unobserved by the astronauts, but... The most gigantic monster explosion of the space age now being blasted into film

— International tagline

Godzilla and Rodan fight the monster from outer space to save the world!

— American tagline

Invasion of Astro-Monster (怪獣大戦争,   Kaijū Daisensō, lit. Great Monster War) is a 1965 tokusatsu kaiju film co-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]


In the year 196X, astronauts Glenn and Fuji embark on a mission to Planet X, a world recently discovered behind Jupiter. There, they encounter an alien race called the Xiliens, who ask to borrow the two Earth monsters Godzilla and Rodan to combat their own terror, King Ghidorah, who they call Monster Zero. In return, they promise the men a "miracle drug" which can cure all illness. The nations of the world agree to the trade, seeing no downside to getting rid of the two monsters. Xilien saucers transport Godzilla and Rodan to Planet X, where they drive off Ghidorah after a brief battle. The tape supposed to contain the formula for the miracle drug, however, turns out to be a demand from the Xiliens to surrender Earth. Their magnetic wave technology had placed King Ghidorah under their control before Glenn and Fuji even arrived on Planet X, and now Godzilla and Rodan are theirs to command as well.

As the invasion begins, Miss Namikawa, an undercover Xilien agent who has fallen in love with Glenn, reveals to him that a specific frequency is capable of inflicting catastrophic damage to the aliens. After they kill her, the Xiliens throw Glenn into the same cell as the inventor Tetsuo Torii, who accidentally discovered that frequency while working on a novelty item he calls the Ladyguard Alarm. Using the Alarm, they escape from the base and bring the device to the JSDF. The three monsters' rampages are halted when vehicles called the A-Cycle Light Rays use enormous speakers and magnetic wave projectors to break the Xiliens' control over them. Driven to madness by the frequency, the Xilien invasion force self-destructs its own base and saucers. Godzilla and Rodan engage King Ghidorah again, and all three tumble into the ocean. Only the space monster emerges, but Tetsuo doubts that Godzilla and Rodan could have perished. To their dismay, Doctor Sakurai informs Glenn and Fuji that they will be Earth's first ambassadors to Planet X.


Main article: Invasion of Astro-Monster/Credits.

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


Main article: Invasion of Astro-Monster/Credits.

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; Toho Champion Festival Version Title)
  • Monster Zero (United States)
  • Invasion of the Astros (United States Military Bases Title)
  • Invasion of the Astro-Monsters (Aborted United States Release Title; United Kingdom)
  • Godzilla vs. Monster Zero (Initial United States Home Video Title)
  • Godzilla vs. the Three-Headed Dragon (Thailand)
  • Invasion Planet "X" (Invasion Planete 'X'; France; French Belgium; Invasie 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 (Befehl 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)
  • The Invasion of Astro-Monsters (A Invasão dos Astro-Monstros; Alternative Brazilian Title)

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 The War of the Gargantuas and Monster Zero double bill poster

Invasion of Astro-Monster was released in North America by UPA and distributed theatrically by Maron Films in 1970 under the title Monster Zero. English dubbing was recorded at Glen Glenn Sound, and had already been completed in June of 1966. 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 The War of the Gargantuas. There were several alterations made:

  • Dialogue was dubbed to English, with several changes made to the script. No date is given in the opening expository text, whereas the Japanese version states the film is set in the fictional year 196X, or 197X in the Champion Festival release. Tetsuo Torii was renamed "Tetsui Teri," and Haruno Fuji was renamed "Haruni" Fuji. The Xiliens' fabricated "cure for cancer" ploy was changed to a "miracle drug" capable of curing all diseases.
  • Altered: Some of Akira Ifukube's score was re-arranged. The opening title music was changed to a cue from later in the film, "The Electromagnetic Capsule." Music during the film's climax was heavily edited, with some sections of the original, jettisoned opening title piece re-integrated.
  • Deleted: All instances of Xiliens speaking in the language of Planet X were deleted or removed from the soundtrack.
  • Deleted: Japanese newspaper headlines for the P-1's return to Earth and the discovery of Godzilla in Lake Myojin were cut.
  • Altered: The location supers for Lake Myojin and Washigasawa were rendered in English accordingly.
  • Deleted: Fuji gesturing in anger and uttering "Damn it!" when the concealed Xilien UFOs in Lake Myojin surface.
  • Deleted: The JSDF commander played by Nadao Kirino ordering his personnel to retreat from Rodan's location as an Xilien UFO approaches.
  • Deleted: Long-distance shot of Godzilla and Rodan's capsules being lifted into the upper atmosphere.
  • Deleted: Part of a short scene aboard the Controller of Planet X's flagship. Fuji tells Glenn to "be on [his] guard," to which Glenn responds "Tell me about it, pal." This exchange is restored (with Fuji's line in Japanese) in Toho's uncut Invasion of the Astro-Monsters version of the film used in the UK and on Criterion and Janus Films' FilmStruck streaming platform.
  • Added: Footfall sound effects were added to Godzilla's victory jumps on Planet X.
  • Altered: The superimposed headlines during the global civil unrest montage were rendered in English accordingly.
  • Altered: Namikawa's letter to Glenn is replaced with an English insert.

The American version runs 93 minutes, a minute and 20 seconds shorter than the Japanese version. In his book Japan's Favorite Mon-Star: An Unauthorized History of 'The Big G', Steve Ryfle comments "The respectful to the original Japanese version." This version of the film was subsequently released on home video in the United States under the title Godzilla vs. Monster Zero. Classic Media released both the original Japanese version of the film and the American version on DVD in the US in 2007. Janus Films provided an uncut English-dubbed version of the film previously distributed in the United Kingdom titled Invasion of the Astro-Monsters to streaming platforms once it acquired the rights to the film in 2017.

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 during the Toho Champion Festival, it sold 1,350,000 tickets, adding up to a rough total of 5,130,000 attendees.[citation needed]

When the film was released in the U.S. in 1970, double-billed with The War of the Gargantuas, it earned $3,000,000.[citation needed]


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.

Video 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. Reissued in 2012, both releases are out of print.



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


Deleted shots


  • This film marks the very first appearance of an alien race in a Godzilla film, a trope that would persist in subsequent films. The alien race introduced in this film, the Xiliens, would become popular recurring villains in the franchise, appearing in video games such as Godzilla: Monster of Monsters! and the television series Godzilla Island, and even reappearing in the film Godzilla: Final Wars in 2004. The Exif aliens featured in the GODZILLA anime trilogy are also inspired by the Xiliens.
  • 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, which would become known as the "Monster Zero March," 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 the PlayStation 4 version of Natsume Atari and Bandai Namco's Godzilla video game that can be used by Godzilla, Godzilla 1964, and Burning Godzilla.
  • The kiss between Miss Namikawa and Glenn in this film was the first and only onscreen kiss in a Toho Godzilla film until GODZILLA: City on the Edge of Battle in 2018.
  • Invasion of Astro-Monster was the first Godzilla film Toho co-produced with an American studio, being co-produced with Henry G. Saperstein's United Productions of America (UPA). It was the second collaboration between Toho and UPA, the first being Frankenstein vs. Baragon, which was released earlier that same year.

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]

  1. 1.0 1.1 Steve Ryfle and Ed Godzizewski. Ishiro Honda: A Life in Film. Wesleyan University Press. p. 185. 2017. ISBN: 9780819577412.
  2. 2.0 2.1 怪獣大戦争|ゴジラ 東宝公式サイト (official page)
  3. Godzilla vs. Monster Zero (1970)
  4. Invasion of Astro-Monster (1965)

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Era Icon - Rodan.png
Era Icon - King Ghidorah.png


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5 months ago
Score 0
Ah yes Godzilla victory dance, majestic.


5 months ago
Score 0


16 months 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)


17 months 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

25 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.