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Invasion of Astro-Monster (1965)
"Kaijû daisensô" (original title)

G  |   |  Action, Adventure, Romance  |  29 July 1970 (USA)
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Ratings: 6.4/10 from 2,951 users  
Reviews: 53 user | 61 critic

Aliens from Planet X request the use of Godzilla and Rodan to fight off King Ghidorah, but have a better use for the three monsters.


(as Inoshirô Honda)
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Cast overview, first billed only:
Nick Adams ...
Akira Takarada ...
Jun Tazaki ...
Dr. Sakurai
Akira Kubo ...
Tetsuo Teri
Kumi Mizuno ...
Miss Namikawa
Keiko Sawai ...
Haruno Fuji
Yoshio Tsuchiya ...
Controller of Planet X
Takamaru Sasaki ...
Chairman of Earth Committee
Gen Shimizu ...
Minister of Defense
Kenzô Tabu ...
Commander from Planet X
Yoshifumi Tajima ...
Nadao Kirino ...
Military Aide
Kôji Uno ...
Namikawa's Associate
Tôru Ibuki ...
Kazuo Suzuki ...


Aliens from the mysterious Planet X, which resides on the dark side of of Jupiter, come to Earth asking its people to help them save their world from the dreaded King Ghidrah by letting them "borrow" Godzilla and Rodan. The aliens are actually planning to use the three monsters to take over our planet. Written by Todd A. Bobenrieth <TAB146@PSUVM.EDU>

Plot Summary | Add Synopsis


G | See all certifications »

Parents Guide:







Release Date:

29 July 1970 (USA)  »

Also Known As:

Godzilla vs. Monster Zero  »

Filming Locations:

Company Credits

Show detailed on  »

Technical Specs



Sound Mix:

(Westrex Recording System)



Aspect Ratio:

2.35 : 1
See  »

Did You Know?


This film wasn't released in the US for five years, perhaps because of the death of star Nick Adams. Another possibility is that producer Henry G. Saperstein, who picked up the US distribution rights, had had a falling out with his previous business partners, Samuel Z. Arkoff and James H. Nicholson of American-International Pictures. Eventually, Maron Films distributed the film in the US. See more »


In one of the shots of the tanks firing at Godzilla and Rodan, a "glass" window in the background keeps wobbling as if made of a sheet of thin plastic. See more »


Controller of Planet X: We need an exterminator, one that would drive away King Ghidorah. We need from you Monster Zero 1 and Monster Zero 2, Godzilla and Rodan.
Astronaut K. Fuji: Are you serious?
Controller of Planet X: Of course. Deadly serious. King Ghidorah was driven from Earth only with the combined strengths of Godzilla and Rodan. Would you help us?
Astronaut K. Fuji: Well, your request is quite unusual. We do not know how to answer that.
Glenn: Plus, we did not know where Godzilla and Rodan are. If we did, how are we suppose to catch them and bring them here?
See more »


Referenced in Mars Attacks! (1996) See more »

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User Reviews

Underrated Godzilla film

I always thought "Monster Zero" (along with the one after, "Godzilla vs. The Sea Monster") was a bit underrated in the Godzilla film list. King Ghidrah makes his second appearance, and it is a lot more fun and interesting than his first ("Ghidrah The Three Headed Monster" from 1964).

This definitely isn't the fastest moving Godzilla film, but there are a lot of cool things to look at as the plot goes along slow at times. And the alien invasion/takeover plot is pretty decent if not overly original. The aliens look pretty cool and their hardware is 60's sci-fi retro, you gotta love it.

Nick Adams is pretty decent enough and gives the film a certain flair. It's a shame he had to leave us so soon, as it would have been a blast to have him return in a future Godzilla film.

The special effects are totally mid-60's Godzilla, with all the obvious miniatures being stomped on by the guys in the monster suits. There's one great shot where a doll of an astronaut gets lowered onto Planet X via an open elevator outside the spaceship, and as the doll is lowered to the ground in one lengthy camera shot, you can't help but laugh a little realizing that there was no attempt whatsoever to make that shot look real, or to hide the fact it's so fake with quick silly editing. But that's part of the charm of the early Godzilla films.

I always thought it was odd when, on Planet X underground, as the leader shows the astronauts the screen showing Ghidrah wildly attacking on the surface, that Ghidrah is in essence attacking nothing but rocks and dirt because that's all there is on the planet's surface. And also how Ghidrah flies past that huge painting of a planet in the distance a few times.

Godzilla and Rodan eventually save the Earth and that's what it's all about in a 1965 Godzilla film. Godzilla by this time was definitely all hero protecting his home planet. It's such a shame that unless a movie looks like a silly music video, so many kids won't watch it. Hopefully a lot of parents are introducing their kids to these old Godzilla films via DVD and video, because they sure aren't on TV much anymore.

14 of 14 people found this review helpful.  Was this review helpful to you?

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