As the X-Men train, the Professor feels the presence of a new mutant and sends the team, incognito, to investigate. Their target turns up as a sideshow attraction at a local circus. The Blob decides to go back with the X-Men, where he learns of his mutant nature and invited to join the X-Men. He declines, but before Professor X can erase his memory, he proves to be more than a match for the X-Men and escapes. He returns to his circus and recruits the other members to launch an assault on the school. They are ultimately defeated by the X-Men and the Professors scientific knowledge which augments his telepathy. Erasing their memory of their encounter.