Zero first appears briefly in Mega Man during Dr. Cain's explanation of what the Maverick Hunters are, where he is seen fighting Sigma while he was still a Maverick. In Issue 37, Zero, investigating an explosion, teleported in and grabbed one of the two people responsible. He then dissuaded X of coming close to becoming Maverick when the latter warned him that the two perps, although dangerous, were still human, and preempted X's thanks for saving him. Zero also explained the history and motives of the group the two people belonged to, the Emerald Spears. He later appeared in the next issue, as part of a task force (which also included Vile and three unnamed Reploids), saving X from the Wily Walker. He then told X to go to Dr. Cain to see if he discovered any weaknesses in the Wily Walker