X-Men #135 (1991 First Series / AKA "New X-Men") 1st Appearance of Ernst / Mike Columbus "Riot at Xavier's Part 1"j

Generation battles generation as the eternal showdown of youth vs. experience hits Xavier's Institute! Pupils against teachers! Children against parents! Who lives? Who dies? Who betrays whom? Be warned: Grant Morrison has promised that this four-part shocker will change the X-Men even more than "E is for Extinction" did!