The X-men are called home from patrol by Professor X who is concerned about a new menace. Angel is mobbed by a group of girls who want autographs or kisses and "saved" by Jean Grey, and Cyclops is able to save some construction workers. The X-men return home as quickly as possible to watch a mental project of a new threat called the Vanisher.
The Vanisher appears to be a mutant who has the ability to teleport. Professor X feels that the skills they have will not be enough so he put them through their paces in the "Danger Room".
Meanwhile, Vanisher warns the US government that he is going to steal national defense plans in three days. Thugs and criminals approach Vanisher to be part of his gang. When the Vanisher attempts to steal the defense plans he succeeds easily and makes the X-men look like a bunch of chumps, disappearing in front of them.
Vanisher demands that the US government hand over 10 million dollars or he will sell the plans to the commies. Alerted by FBI Special Agent Fred Duncan, the X-men and Professor X meet the Vanisher and his gang on the lawn of the White House. This time, Professor X uses his telepathy to give Vanisher amnesia so he can't use his powers and the X-men capture his gang easily.
This is the 1st appearance of Vanisher and Special Agent Fred Duncan.