Professor Doctor Karl Ruprecht Kroenen is a supervillain in the Hellboy comic book series, created by Mike Mignola. Kroenen is a Nazi occult scientist and disciple of Rasputin who was involved in the ritual that first brought Hellboy to Earth in the 1940s; disappearing after the end of World War II, Kroenen and several allies return from suspended animation in the 1990s to continue pursuing their apocalyptic goals. Due to a disfiguring accident, Kroenen always wears a gas mask and bodysuit that together obscure his entire body.
- Occupation
- assassin, mass murderer, physician, scientist
- Citizenship
- Germany
