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The Decrepit One

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Radioactive Man Icon.png The contents of this article or section are related to the Radioactive Man universe. They are considered fictional in The Simpsons.
The Decrepit One
The Decrepit One.png
Character Information
Male ♂
Fictional deceased
Hair: Bald
White beard
Occupation: Mystic teacher
First appearance: The Grotesque Garage Sale of Gargamash!

The Decrepit One was the mystic teacher of Plasmo and Lebaron Fordor.


The Decrepit One taught Plasmo and Lebaron Fordor the basics of magic. However, Lebaron Fordor turned to evil and threw The Decrepit One into a bottomless chasm, killing him. The Decrepit One's astral form then took up residence in Plasmo's spare bedroom.

Behind the Laughter[edit]

The Decrepit One is a parody of the Ancient One from Marvel Comics.