Karl Ruprect Kroenen

Karl Ruprect Kroenen is a sinister figure from the Hellboy universe — a masked, surgically altered former Nazi occultist and assassin whose fanatical devotion to dark science made him one of the most unsettling operatives ever associated with Grigori Rasputin's inner circle.

Karl Ruprect Kroenen made his chilling entrance in the very first issue of Hellboy: Seed of Destruction in 1994 — the debut of Mike Mignola and John Byrne's landmark Dark Horse series — and that's as auspicious a beginning as the modern age of horror comics has to offer. A figure who haunts the shadowy corners of the Hellboy universe across nearly three decades, Kroenen keeps genuinely sinister company: Grigori Rasputin, Ilsa Haupstein, and the Big Red himself all share his pages, placing him squarely at the dark heart of Mignola's occult mythology. His appearances stretch from Seed of Destruction through B.P.R.D. Hell on Earth and into the period adventures of Hellboy and the B.P.R.D.: 1952–1954, marking him as a persistent, unsettling presence across the full sweep of this beloved universe. For fans who want to understand the deep, dread-soaked lore that makes Dark Horse's Hellboy saga so enduring, Kroenen is exactly the kind of figure worth tracking down.