-> '''Godzilla:''' Hey Angurius!\\
'''Angurius:''' What do you want? \\
'''Godzilla:''' Something's funny going on. You better check. \\
'''Angurius:''' Okay! \\
'''Godzilla:''' Hurry up!
-->-- Godzilla and Angurius's conversation in the... [[SuddenlyVoiced dub]].

The 12th entry in the long-running ''Franchise/{{Godzilla}}'' series, also known as ''Godzilla on Monster Island''. It is the final film to star Haruo Nakajima as the King of Monsters. Godzilla must once again battle his old foe King Ghidorah to save Tokyo, and this time he brought a friend! It's also called ''Chikyū Kogeki Meirei Gojira tai Gaigan'' in Japan.

The plot revolves around a young manga artist by the name of Gengo Kotaka, who gets hired as a concept artist for a new theme park featuring a to-scale tower in Godzilla's likeness. He and his friends soon find out that the men running the theme park are in fact aliens trying to conquer the world with kaiju! These aliens are in fact giant cockroaches disguised as humans from some planet in Space Hunter Nebula-M. They plan on summoning & control a couple of monsters with "Action Signal Tapes". Our human heroes activate one of them by mistake, which brings the attention of Godzilla and his pal Angurius, who are just chillin' on Monster Island (in the only scene that actually takes place on Monster Island). [[SuddenlyVoiced They chat]].

Angurius pays a friendly visit to Tokyo, gets shot at, and goes back to tell Godzilla what's up. The aliens summon King Ghidorah and a new monster, Gigan, who may prove to be Godzilla's deadliest foe yet. Godzilla and Angurius show up to confront the alien duo with the final battle taking place in the aforementioned theme park, where it turns out the Godzilla tower has a giant laser.

!!This film contains examples of the following:
* AFriendInNeed: Godzilla and Anguirus have quite a few moments of these in the film.
** When Gigan starts kicking Anguirus in the head, how does Godzilla respond? By chucking a boulder at Gigan's head.
** Seeing Godzilla in trouble, Anguirus rushes to his aid, and receives Gigan's chest saw in his face as a result.
** Godzilla returns the favor when he sees Anguirus being attacked by King Ghidorah.
* ActionGirl: Tomoko Tomoe, is a black belt and gets to demonstrate these skills when rescuing her boyfriend and his friends from the disguised Nebulans.
* ActionGirlfriend: Tomoko is the girlfriend of the protagonist Gengo Kotaka and a martial aritst. Unlike other examples, she's more interested in getting him a job than a superhero life.
* BackFromTheDead:
** Inverted. Since this film takes place in 1970's, then King Ghidorah's not gonna die.
** The chairman Fumio and his former English teacher and secretary Kubota, [[spoiler:as human receptacles for the invaders.]]
* BashBrothers: Godzilla and Angurius tag team King Ghidorah and Gigan. Their opponents are not as harmonious after they're released from mind control.
* BigCreepyCrawlies: The invading aliens are from a desolate, polluted planet and may be one of the few survivors of that world's wildlife. They're man-sized roaches.
* BigDamnHero: Tomoko rescues her Gengo and his allies from the Nebula. Then she does the same for Mr.Shima right before he was going to be executed.
* CharacterDevelopment: Aside ''Film/DestroyAllMonsters'', Godzilla makes one where he's longer a selfish monster since ''Film/SonOfGodzilla''. In the next film, he becomes friendly enough to fight alongside other monsters.
* CoolChair: Fumio the chairman puts the CHAIR in chairman in a futuristic-looking one that can swivel.
* ContinuityNod:
** The Japan Defense Force recognizes King Ghidorah's roar when the alien kaiju first approach.
** Godzilla goes after Ghidorah, the monster he's familiar with, first before directly fighting Gigan.
* DidYouJustPunchOutCthulhu: Gigan is notably the first villain to make Godzilla ''bleed''.
* FriendshipMoment: See AFriendInNeed above.
* GreenAesop: The Nebula come from a planet that was ruined by its previous inhabitants, and they note that humans are doing the same thing.
* KensingtonGore: the blood used for the monster fights is extremely bright and opaque, almost resembling paint.
* NotSoDifferent: The dominant species who originally inhabited Nebula Space Hunter M.
-->"The dominant species was very like you. A little different…not much though, not much…because just like you they set about ruining the planet."
* OddlyNamedSequel2ElectricBoogaloo: The only '70s film with a Japanese subtitle (''Earth Destruction Directive''), presumably as a callback to the more elaborate titles of the '60s.
* PantyShot: Machiko, during her first appearance in the film when she bumps into Gengo. It's the ONLY panty shot in the entire franchise.
* RecycledSoundtrack: The film's soundtrack is almost entirely recycled music from other films, all of which were scored by Akira Ifukube.
* SpaceWhaleAesop: Keep the planet clean, or the roaches will TAKE OVER THE WORLD!
* StockFootage: The footage of Monster Island is from ''Destroy All Monsters'', Godzilla and Angrius swimming in the ocean is repeated three times and segments of the fight with King Ghidorah come from earlier fights. When Gigan hides behind some trees, footage from ''Film/WarOfTheGargantuas'' is shown, including one of the Gargantuas "filling in" for Gigan. A Mothra larva also has an unintentional cameo in one of the reused shots.
* StrongAsTheyNeedToBe: Godzilla's second wind comes out of nowhere and he stomps on King Ghidorah and Gigan.
* SuddenlyVoiced: [[http://www.youtube.com/watch?v=uJMDyWH_ZmE "They chat".]] They also talk in the Italian and Spanish dubs, but the French version has no dubbing OR text, and the German version cuts these scenes entirely.
* WeaponizedLandmark: The Godzilla Tower turns out to have a laser powerful enough to hurt Godzilla.
* WhyDidItHaveToBeSnakes: Tomoko Tomoe is terrified of roaches.