Juggernaut is a Marvel Comics character, also known as Cain Marko. He is a mutant with superhuman strength and durability, and he is best known for his nearly unstoppable nature. Juggernaut is one of the X-Men's most formidable enemies and has also clashed with other Marvel heroes like Spider-Man and the Avengers. A tall, muscular and powerful menace, able to simply break walls by rushing through them, he is literally the definition of a Juggernaut.