Because of his association with the X-Men, Juggernaut is often mistakenly labeled a mutant. Juggernaut traditionally possessed huge power, of mystical origin. He had tremendous physical strength, a total resistance to physical injury due to his mystic spell of invulnerability; an impenetrable force field that he could summon at will; and unlimited stamina. His spell also granted him unbreakable skin, therefore making his forcefield an added protection in case he did not wish for a certain attack to touch his physical body. Due to the mystical energies flowing through his body, he did not need to eat, breathe, or drink fluids. As a vessel of mystic energy, he also possessed many abstract powers that had yet to be fully revealed. Finally, while moving, he could, essentially, not be stopped, except in extreme cases such as when he fought the Incredible Hulk and the psychic being Onslaught. To compensate for his most significant vulnerability — to telepathic assault — he also wore a helmet of a mystical alloy, which prevented his mind from being read or attacked.