Uncanny X-Men Vol.1 #111
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.
Printed: Jun 1978
Writers: Chris Claremont
Art: John Byrne and Terry Austin
Cover: Dave Cockrum, Terry Austin and Danny Crespi