History Main / MiracleGroMonster

* The classic children's book ''[[http://en.wikipedia.org/wiki/A_Fish_Out_Of_Water_(book) A Fish Out of Water'' involves a boy overfeeding a fish despite the warnings of the pet store owner. The fish begins to grow bigger and bigger, with the boy having to find larger and larger containers to put the fish in.
* The Monster Blood from the ''Literature/{{Goosebumps}}'' subseries of the same name, along with whoever or whatever eats some, gradually grows bigger.

* ''Film/{{Evolution}}'': The aliens react to fire by melding and enlarging. So when the Army decides to napalm-bomb them... [[spoiler:they cause one singular cell to rapidly evolve into a simple, gigantic amoeba that wipes out a substantial amount of the military before it's de-evolved due to chemicals in shampoo.]]

* In ''WesternAnimation/TheGrimAdventuresOfBillyAndMandy'' episode "Little Rock of Horrors", a parody of ''Little Shop of Horrors'', Billy discovers an evil meteor that crash-landed in his backyard, which has an appetite for brains, with it growing as it eats all the brains in Endsville. Mandy's brain, however, [[TooSpicyForYogsothoth ended up being too spicy for him]].

* The classic children's book ''[[http://en.wikipedia.org/wiki/A_Fish_Out_Of_Water_(book) A Fish Out of Water.]]''
* Monster Blood from the ''Literature/{{Goosebumps}}'' subseries of the same name, along with whoever or whatever eats some.

* ''WesternAnimation/PhineasAndFerbTheMovieCandaceAgainstTheUniverse'': Super Super Big Doctor's [[spoiler: mind controlling plant, Mama, needs carbon dioxide to survive and create mind controlling spores. While in Earth's atmosphere, which is rich with carbon dioxide, it'll actually grow to the size of buildings and come to life, destroying or eating anything it sees.]]

* In ''Film/HoneyIBlewUpTheKid'', Wayne Salnski's infant son Adam was accidentally zapped by a growth ray, causing him to slowly increase in size each time he got near an electrical device[[note]]being a TechnoBabble thing[[/note]].

* The classic children's book ''[[http://en.wikipedia.org/wiki/A_Fish_Out_Of_Water_(book) A Fish Out of Water]]''.

* ''VideoGame/RatchetAndClankGoingCommando'': The Protopet starts out as being about the size of Clank, but after [[spoiler: Captain Quark]] zaps it with device that's intended to render it harmless, it instead grows to roughly the size of Ratchet's SpacePlane and becomes the final boss. [[spoiler: It's because Quark put the batteries in backwards]].

* In ''WesternAnimation/TeenageMutantNinjaTurtles1987'' episode "The Case of the Killer Pizzas", Shredder and Baxter Stockman obtain a trio of meatball-like eggs from Dimension X. Upon being exposed to electricity[[note]]ala being in a microwave while a pizza is being microwave[[/note]], they hatch into miniature {{Xenomorph Xerox}}es. This turns out to be their infantile stage, however, cause once they jump into sewer water, they rapidly grow to their full size.

* In ''WesternAnimation/TeenageMutantNinjaTurtles1987'' episode "The Case of the Killer Pizzas", Shredder and Baxter Stockman obtain a trio of meatball-like eggs from Dimension X. Upon being exposed to electricity[[note]]ala being in a microwave while a pizza is being microwave[[/note]], they hatch into miniature {{Xenomorph Xerox}}es. This turns out to be their infantile stage, howeveer, cause once they jump into sewer water, they rapidly grow to their full size.

* In ''WesternAnimation/TeenageMutantNinjaTurtles'' episode "The Case of the Killer Pizzas", Shredder and Baxter Stockman obtain a trio of meatball-like eggs from Dimension X. Upon being exposed to electricity[[note]]ala being in a microwave while a pizza is being microwave[[/not]], they hatch into miniature {{Xenomorph Xerox}}es. This turns out to be their infantile stage, howeveer, cause once they jump into sewer water, they rapidly grow to their full size.

* An episode of ''WesternAnimation/TaleSpin'' has Molly take in a creature called a Yenkara, which grows giant when it gets wet.

* Happens to Nega (a tiny extra-terrestrial cat) when he is infected by Earth's common-cold virus, in the gag episode "The 'atchoo!' of horrors" of ''Anime/MagicalAngelCreamyMami''.

[[quoteright:250:[[WesternAnimation/TheAmazingWorldOfGumball https://static.tvtropes.org/pmwiki/pub/images/20210123_105634_3.jpg]]]]
[[caption-width-right:250:Pictured above: Kenneth.\\

* In the story "The Baker's Cat" by Joan Aiken, a cat grows larger than the entire town after his owner feeds him yeast.
* In the children's book ''There's No Such Thing as a Dragon'', Billy's mom's denial of the dragon's existence causes it to continually grow larger.

* Beebo from ''WesternAnimation/ThePowerpuffGirls'' was designed to be fed only once in his lifetime, but the girls [[TooManyCooksSpoilTheSoup ended up feeding it once]] ''[[TooManyCooksSpoilTheSoup each]]''. It ends up eating half the town.

* Beebo from ''WesternAnimation/ThePowerpuffGirls'' was designed to be fed only once in his lifetime, but the girls ended up feeding it once ''each''. It ends up eating half the town.

** ''VideoGame/SuperMetroid'': There isn't much difference when an infant Metroid matures to its larval stage in most cases, but the "baby" Samus spared ends up growing to an unprecedented size, even counting the higher forms as they were depicted in ''VideoGame/MetroidIIReturnOfSamus''/''VideoGame/MetroidSamusReturns''. It also grows differently, as it has no indication of approaching Alpha Metroid status, though later games imply that the true, natural evolution to the Alpha -> Omega Metroid line is only possible on SR-388 (or places that emulate that atmosphere).

[[quoteright:350:[[WesternAnimation/TheAmazingWorldOfGumball https://static.tvtropes.org/pmwiki/pub/images/20210123_105634_3.jpg]]]]
[[caption-width-right:350:Pictured above: Kenneth.\\

* ''Anime/DemashitaPowerpuffGirlsZ'' has an episode where a duck grows bigger.

* One WesternAnimation/DonaldDuck comic had Donald bringing a special African snail to eat the crab grass on Uncle Scrooge's lawn (which Donald had caused by buying cheap lawn seed). What he didn't realise was that the snail would keep growing as long as it had a steady source of food.

* While he's already [[KillerRabbit pretty competent in the combat area]], Little Birdie from ''VideoGame/MetroidOtherM'' later becomes [[spoiler:a bizarre, furry scorpion-dinosaur, then a space dragon. Yes, ''[[ArchEnemy that]]'' space dragon. JokerImmunity at it's finest.]]

* In ''WesternAnimation/TheGrimAdventuresOfBillyAndMandy'' episode "Little Rock of Horrors", a parody of ''Little Shop of Horrors'', Billy discovers an evil meteor that crash-landed in his backyard, which has an appetite for brains, with it growing as it eats all the brains in Endsville. Mandy's brain, however, [[[TooSpicyForYogsothoth ended up being too spicy for him]].

* The ''WesternAnimation/CourageTheCowardlyDog'' episode "Muriel Blows Up" has this happen to each of the main characters.

* Tank on ''WesternAnimation/LiloAndStitchTheSeries'' has this happen to him the more he eats.

* The sponge monster from the ''WesternAnimation/MyLifeAsATeenageRobot'' episode "Speak No Evil" grew every time it was exposed to water.

* In ''WesternAnimation/TheGrimAdventuresOfBillyAndMandy'' episode "Little Rock of Horrors", this happens to a Meteor that falls out of a sky that eats brains.
* An episode of ''WesternAnimation/ChipNDaleRescueRangers'' has Dale adopting an alien lizard that appears to play the trope straight at first, before revealing that he is just as intelligent as the main characters. However, he loses intelligence at the same time as he gains size, and it's stated that the ancient dinosaurs were the result of a previous away team succumbing to this fate.

* In the ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' episode [[Recap/MyLittlePonyFriendshipIsMagicS2E10SecretOfMyExcess "Secret of My Excess"]], Spike becomes bigger and bigger the greedier he gets.