The massive Marvel crossover event Fear Itself found the entire population of the company’s comic book universe confronting their greatest nightmares. An Asgardian entity known as the Serpent called to Earth a collection of hammers that would bestow their bearers with tremendous power. The Juggernaut happened to end up with one, transforming him into Kuurth, Breaker of Stone. This horrific goliath stampeded through downtown San Francisco, easily trouncing the band of X-Men attempting to thwart him.
However, the Juggernaut’s willing acceptance of the power of Kuurth offended Cyttorak, the spirit that had long been the source of his strength. Cyttorak abandoned his host, and Colossus offered himself up as a new vessel. Emerging as “the Unstoppable Colossus,” a transformed Piotr charged forth with what had been the power of the Juggernaut, successfully standing up to the stonebreaker. Though he feared the lust for destruction imbued in him by Cyttorak’s presence, Colossus was triumphant, and Kuurth fled.