Professor Xavier and the X-Men #5

Magneto and the Brotherhood take over the island nation of Santo Marco and Xavier sends the X-Men to boot them off. When Quicksilver and the Scarlet Witch discover that Magneto has rigged the entire island to blow up and kill the X-Men, along with all of the local citizens, Quicksilver disarms the bomb and saves his foes. The Brotherhood escapes and the X-Men prepare to give chase.