Uncanny X-Men (1963) #111"Mindgames!" Part 1 of 3. Story by Chris Claremont. Art by John Byrne and Terry Austin. The bouncing blue Beast takes time off from the Avengers to attend the Circus. What he finds shocks him to his very core the main attractions are none other than the X Men! How did Xavier's team of heroes wind up in this position and who is responsible. This all sets up a last page that will make your blood run cold. NOTE: 1st appearance of Mesmero.