-> '''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 Creator/HaruoNakajima 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.
** Anguirus sees Godzilla being attacked by high powered weaponry from the Godzilla Tower at the center of the amusement park where the battle is taking place, while Gigan and Ghidorah look on. Headless of the danger to himself, he charges to the rescue, willing to go headlong into Gigan's buzz saw to try to save his friend. Shows just how far these two have come from their first encounter.
** 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.]]
* BadassNormal: Aside from his sheer size and strength (and maybe the spines on his back), Anguirus has generally always been depicted as otherwise powerless. Yet he is the first Kaiju to deal a strong enough attack to King Ghidorah to draw ''blood'', something Godzilla himself wouldn't manage until the Heisei era.
* 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.
* BigDamnHeroes: Tomoko rescues her boyfriend Gengo and his allies from the Nebula. Then she does the same for Mr.Shima right before he was going to be executed.
* BrandishmentBluff: Gengo gets held up by an ear of corn. Since he couldn't see it and could only feel something pressing against his back, he thought it was a gun.
* CharacterDevelopment: Aside ''Film/DestroyAllMonsters'', Godzilla makes one where he's longer a selfish monster since ''Film/SonOfGodzilla''. To elaborate, he was very destructive as the first Godzilla, and that carried over until his first battle with King Ghidorah. After targeting humans less once they found out they have been attacking unprovoked, he becomes a less grouchy neighbor to the point of helping humans fight a common foe. In the next film, he becomes friendly enough to fight alongside other monsters.
* ChekhovsSkill: Early in the film, Gengo offhandedly mentions that Tomoko is a black belt in karate. She ends up using these skills to rescue him and several other characters.
* 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.
* DecoyGetaway: After escaping from Godzilla Tower, the heroes get their car to drive away by itself (presumably by putting something heavy on the gas pedal). The car gets destroyed by Godzilla Tower's laser, then the aliens relax, thinking they have been destroyed, allowing them to get away for real.
* DidYouJustPunchOutCthulhu: Gigan is notably the first villain to make Godzilla ''bleed''. Anguirus, due to stock footage, is the first and second to do so to Ghidorah as footage from ''Destroy All Monsters'' is reused in this film, and once again shows Anguirus drawing blood from the King of Terror. This film takes place chronologically before ''Destroy All Monsters''(which was set in the then-future year of 1999, while Godzilla vs. Gigan was set in the 1970s) meaning this is technically the ''first'' time Anguirus does so. Score two for the BadassNormal!
* 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.
* ImpairmentShot: After getting beaten up by Gigan, we get a shot from Godzilla's POV of him fading in and out of consciousness.
* 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.
* TheShadowKnows: Somehow, the disguised aliens' shadows are of their true roach forms. No explanation is given how this is possible, considering their disguises are bodysuits and not a glamour.
* SpaceWhaleAesop: Keep the planet clean, or the roaches will TAKE OVER THE WORLD!
* StockFootage:
** The footage of Monster Island is from ''Destroy All Monsters'', with shots of Godzilla with his son originating from ''Son of Godzilla''.
** Godzilla and Angrius swimming in the ocean is repeated three times.
** Several segments of the fight with King Ghidorah come from earlier fights in other Godzilla movies. (''Film/GhidorahtheThreeHeadedMonster'', ''Film/InvasionofAstro-Monster'', ''Film/DestroyAllMonsters'').
** 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.
* TeenGenius: Fumio the chairman is a 17-year-old who appears to do coordinate geometry and orbital calculations as hobbies. Subverted since he turns out to be an alien in disguise, and was rather dull in his original life.
* {{Tsundere}} / ViolentlyProtectiveGirlfriend: Tomoko is both of these to Gengo.
* WeaponizedLandmark: The Godzilla Tower turns out to have a laser powerful enough to hurt Godzilla.
* WhyDidItHaveToBeSnakes: Karate expert Tomoko Tomoe is terrified of roaches. Ends up being partially justified, since the Nebulans ''are'' giant cockroaches, albeit masquerading as humans.
* YourSizeMayVary: The Godzilla Tower is said to be 50 meters tall (Godzilla's height), yet Ghidorah and Gigan look a fraction of its size when flying next to it (and Ghidorah is 100 meters tall).