Professor Xavier grants the X-Men a vacation due to their performance in battle against Juggernaut and other villains. Shortly after the X-Men leave, Professor Xavier sees a newscast about the anthropologist Dr. Bolivar Trask. Dr. Trask informs the world that he believes mutants are a menace, and that they are hiding amongst normal humans preparing to take over the world. Professor Xavier knows that media hysteria is one of the X-Men's worst enemies so he calls a TV station and sets up a public debate with Dr. Trask. At the debate Dr. Trask demonstrates the capabilities of his mutant-hunting Sentinels. Suddenly the Sentinels turn on Dr. Trask believing that they are superior and should not be ruled by anyone. Professor Xavier mentally contacts his X-Men to come out and help fight the Senti