Magneto returns to battle the X-Men, and he's brought the new Brotherhood of Evil Mutants! Courtesy of the boundless imaginations of Stan Lee and Jack Kirby, Quicksilver and the Scarlet Witch enter the Marvel Universe alongside enduring mutant menaces Toad and Mastermind! As Magneto and Professor X clash on the astral plane, the Brotherhood overruns and conquers the small nation of Santo Marco in the name of mutant supremacy, and the stage is set for a dramatic showdown with the X-Men! A rivalry for the ages begins here, and Wanda and Pietro Maximoff start their incredible journey from villainy to their ultimate destiny in the mighty Avengers! It's one of the all-time great Marvel comic books, boldly re-presented in its original form, ads and all! Reprinting X-MEN (1963) #4.