The story depicts Thunderbird journeying to an Apache reservation, hoping that someone from his past can help him understand the changed world into which he was resurrected. Instead, he discovers a new threat to the indigenous mutant community.
Thunderbird, a.k.a. John Proudstar, is a member of the Apache nation who first appeared in Giant-Size X-Men #1 in 1975; he died on his second mission, making him the first of the X-Men to be killed in action. He was resurrected at the end of Trial of Magneto.