Karl Ruprect Kroenen

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Karl Ruprecht Kroenen^{[note 1]} is a fictional supervillain in the Hellboy comic book series, created by Mike Mignola.

In the comics, Kroenen was a relatively unremarkable Nazi SS scientist, whose most distinguishing characteristic was that he always wore a gas mask and protective bodysuit, which Mignola attributes to a disfiguring accident of some kind.

Director Guillermo del Toro created a significantly expanded biography for the character, to appear as a supervillain in the 2004 film adaptation.
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