-> ''"There isn't a job that's too tough for me... except for this one time, when I was married to a real stubborn woman."''
-->-- '''Takuya'''

The nineteenth ''Franchise/{{Godzilla}}'' film and the fourth in the Heisei series. After the success of ''Film/GodzillaVsKingGhidorah'', Toho decided to bring back another familiar monster. While there are similarities to ''Film/MothraVsGodzilla'', such as greedy businessmen and kidnapped fairies, the film is its own animal. The film sold well and became the most popular entry in the Heisei series. [[RunningGag Reffered to as]] ''[[NamesTheSame Gojira tai Mosura]]'' in Japan.

A meteor hits the ocean, causing many natural disasters. A repenting tomb raider, his ex-wife, and the secretary of a corrupt corporation are sent to investigate the effects on Infant Island. There, they find a giant egg and the Cosmos, a pair of tiny twin girls whose role is to watch over the balance of nature and who are the LastOfTheirKind.

They tell of an ancient civilization that angered the Earth so much with a weather machine made to control the world's climate that the Earth created and unleashed a creature called Battra. Unfortunately, Battra [[GoneHorriblyWrong proved to be so bloodthirsty]] that its path of destruction [[NiceJobBreakingItHero also brought harm to the Earth]], which created Mothra to counteract it. Battra and Mothra clashed fiercely, the civilization being lost in the battle, and the two eventually sealed themselves in eggs, with Mothra's being the one the team has uncovered.

The Cosmos agree to go to Japan with the giant egg, but Godzilla intercepts them. Mothra hatches and gets saved from Godzilla when a revived Battra clashes with the King of the Monsters. They are sucked into the earth by a underwater eruption and Mothra leaves.

The Cosmos are kidnapped by the company secretary, whose CEO plans to exploit them for all they are worth. But Mothra won't stand for this and is heading for Tokyo. Can our heroes rescue the Cosmos before Mothra does too much damage? And how would they deal with Godzilla and Battra, who have survived being swallowed by lava and are converging on the area?

!! This film contains examples of
* ActionGirl: Mothra, once she obtains her more mature form.
* AssholeVictim: Takeshi Tomokane in the manga adaptation. Yeah, you should've looked where you were driving. At ''Godzilla's foot''.
* BigBad: Godzilla shows up in the movie to do this usual Godzilla thing, forcing Mothra and Battra to team up to stop him.
* BigBadDuumvirate: Two villains for the price of one. The [[CorruptCorporateExecutive Marutomo CEO]], and Godzilla.
* DeathByAdaptation: Masaeko (Masako) dies from her wounds in the manga adaptation. Takeshi crashes into Godzilla's foot.
* EvilCounterpart[=/=]SpearCounterpart: Battra to Mothra, though he's more of an Anti-Heroic Conterpart as far as the Earth is concerned. He's dedicated to defending the ''Earth'', but is far less concerned with intelligent inhabitants.
* EyeBeams: Battra in his adult form.
* FallenHero: Battra.
* FlyingFirepower: Battra and Mothra can both fire blasts of energy from their antennae while flying.
* GaiasVengeance:
** The weather machine of the Cosmos civilization angered the Earth, producing Battra.
** The series of events that happen to Takeshi Tomokane due to natural disasters are outright said to be the Earth getting its revenge on his company for their reckless destruction of it.
* {{Expy}}: The Marutomo CEO is [[Film/KingKongVsGodzilla Mr. Tako]] meets [[Film/MothraVsGodzilla Torahata]].
* ForegoneConclusion: As the previous film shows the state of the future, Mothra was successful on her mission.
* GreenAesop: All over the place.
* HeelFaceTurn: Battra, as well as the Marutomo Company secretary, Kenji Andoh.
* HeroicSacrifice: Battra in dropping Godzilla into the ocean.
* KnightTemplar: Battra's ultimate goal is to protect the Earth.... even if that means annihilating most of humanity.
* LargeHam: Mr. Tomokane's breakdown at the end proves even hammier with Rik Thomas' voice in the dub.
-->*voice becomes progressively higher* The Earth wants its revenge, does it? Fine with me! I don't care! I don't care... I don't caaaaaare!!!
** Dobashi.
* LaserGuidedKarma: Takeshi Tomokane has 2 (''negatively''): In the film, all of his accomplishments and project are utterly destroyed ever since he kidnapped the Cosmos. In the manga adaptation, killing Masaeko, crash into Godzilla's foot.
* LethallyStupid: Takeshi Tomokane, the Marutomo CEO is clearly a danger to himself as well as everyone else. First, he has the bright idea to kidnap and exploit the Cosmos, and if that wasn't bad enough, he insists on ''killing Mothra'' when [[MamaBear she inevitably comes]] to rescue them. Incompetence doesn't even begin to describe it.
* MamaBear: Mothra is pretty damn determined to save the fairies.
** Once the song to summon Mothra is sung, you know you've screwed up monumentally somehow.
* MonumentalDamage: The Diet Building, where Japan holds parliament, becomes the location where Mothra creates her cocoon.
* NighInvulnerability: Godzilla and Battra come out of being swallowed by magma pretty well.
* OutsideContextProblem: In this story about environmental degradation and ancient magical forces involved with Mothra and Battra, the giant radioactive dinosaur who's in the title just kinda walks into the plot.
* SpaceWhaleAesop: Don't screw up the environment or else a ''giant bug monster with laser vision'' will rise from the ocean to blow up everything and fight a fire-breathing radioactive dinosaur.
* TakeUpMySword: Mothra takes Battra's place in stopping the meteor that would destroy Earth in 1999.
* TooDumbToLive: Does it have to be repeated what was stated 3 times already?
* TookALevelInJerkass: Godzilla is considerably more villainous in this movie than in other films. He doesn't attack because of a grudge against humanity or even neutral. He attacks the completely helpless Mothra Egg more or less because he can.
* ThemeMusicPowerUp: The Cosmos don't waste their singing talents in powering up Mothra. They even do a little healing of Battra.
* VillainBall: The Marutomo CEO. Yes, please by all means exploit the Cosmos for your business. Yes, by all means ''refuse'' to give them up when the giant indestructable Moth creature comes to rescue them. It certainly won't turn out badly for you.