Karl Ruprecht Kroenen is a fictional character 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, possibly due to severe obsessive-compulsive disorder and fear of bacteria.

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

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