Screenshot from the episode

"Nightmare in Retroville" is the only  Halloween episode of the animated series The Adventures of Jimmy Neutron: Boy Genius.


Jimmy's Neutronic Monster-Maker transforms Sheen into a werewolf, Carl into a vampire and Hugh into Frankenstein's monster. However, Jimmy's invention works too well, making those three into real monsters. The little genius's Halloween is complicated when Carl and Sheen bite Cindy and Libby and then there are five monsters chasing him.

See the article on Nightmare in Retroville on Fandom's Jimmyneutron wiki.

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