Zane Yama is the son of Cain Marko AKA Juggernaut and Sachi Yama. He is also known as J2.
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When young Zane Yama was bullied by school bully Miller Hallendale, he discovered that he had inherited the powers of his father, the unstoppable Juggernaut, a reformed hero and member of the X-Men. J2 lived most of his younger life without the guidance of his father, who had gone missing on a mission with the X-Men.