Jimmy's new monster machine accidentally turns Carl, Sheen, and Hugh into monsters and they haunt the town.
Tropes:
- Animorphism: Vampire!Carl turns into a bat in which his head makes up the body with two wings on either side. Once she’s turned into a vampire, Cindy later does the same.
- Attack of the 50-Foot Whatever: Jimmy turns himself into a giant octopus to stop the other monsters.
- Bilingual Bonus:Sheen calls himself an “hombre lobo” aka a wolf man.
- Character Catchphrase: Carl asks if he can say Jimmy’s famous “To the lab!” line and messes it up horribly:Carl: To the place where Jimmy has all his neat stuff and where he invents things and then something goes wrong and we have a big adventure!
- Eat the Camera: When Vampire!Carl bites Cindy.
- Freeze-Frame Bonus: There appears to be a picture of Michael Jackson as an option on Jimmy’s monster machine.
- Funny Background Event: While Hugh is reminiscing about his favorite monster movie, “Octopus Man,” Carl trips while going up the stairs to Jimmy’s room.
- Gone Horribly Right: Jimmy’s Neutronic Monster Maker works really well, so well that his friends not only get the appearances of the monsters but the abilities as well.
- Halloween Episode
- Hypnotic Eyes: Vampire!Carl is shown to have this power. It works on Cindy, but Monster!Hugh prevents Judy from being affected. Later, Vampire!Cindy is shown trying to do this to Werwolf!Libby, but is unsuccessful.
- The Igor: Jimmy acts like this with his back hunched and a creepy look on his face while using his monster maker.
- Impending Doom P.O.V.: We see from Sheen’s red-tinged perspective as he hunts Libby.
- Layman's Terms: This exchange between Jimmy and Sheen:Jimmy: The monster maker must have mutated Carl’s molecular structure on the subatomic level, altering his DNA.Sheen: And now again in English?Jimmy: He’s a real vampire!
- Mind-Control Eyes: Cindy gets these when Vampire!Carl hypnotizes her.
- Monster Mash: Several characters get turned into monsters in this episode:
- Sheen and Libby as werewolves.
- Carl and Cindy as vampires.
- Hugh as Frankenstein's Monster.
- Pop-Culture Pun Episode Title: A reference to A Nightmare on Elm Street.
- Scary Flashlight Face: The boys do this while trying to figure out what to wear for Halloween.
- Severely Specialized Store: Good thing “Lucky Tony’s House of Garlic,” right across the street from “House of Blue Pants,” was still open because Vampires Hate Garlic and Jimmy was able to escape Carl and Cindy.
- Jimmy is saved in a similar fashion from Sheen and Libby by “Hi Ho Silver Store.”
- Shout-Out:
- The title card's font is the same as the logo of A Nightmare On Elm Street Part 2: Freddy's Revenge.
- Sheen references Gene Wilder's character from Young Frankenstein (pronouncing Frankenstein as "Fronkensteen").
- Miss Fowl recites lines from the 1941 movie The Wolf Man - "Even a man who is pure in heart and says his prayers by night, may become a wolf when the wolf-bane blooms and the autumn moon is bright."
- Cindy goes as “Muffy the Vampire Annihilator” for Halloween.
- Too Old to Trick-or-Treat: Jimmy thinks trick-or-treating is childish, but he still wants the free candy so he makes a deal with Sheen and Carl that he’ll turn them into scary monsters in exchange for some of their candy.
- Torches and Pitchforks: The citizens of Retroville form an angry mob to drive the monsters out of their town.
- Unabashed B-Movie Fan: Hugh watches an old black and white monster movie about a giant octopus.
- Wolves Always Howl at the Moon: Right after Sheen gets turned into a werewolf, he howls at a bright white light in Jimmy’s lab.
- Yellow Eyes of Sneakiness: Cindy’s eyes become yellow after being turned into a vampire.
