The X-Men #37

From the pages of 1967 Marvel, The X-Men #37 puts our mutant heroes on trial — charged with nothing less than treason against Homo Superior — as a mysterious helmeted figure looms in the foreground, observing the team (Marvel Girl, Cyclops, Beast, Iceman, and Angel) caught in a swirling confrontation within a glowing sphere. Above it all, a bald, anguished figure crackles with mental energy, while the cover boldly announces the X-Men's face-to-face reckoning with the macabre "Factor Three." With interior work by Roy Thomas, Ross Andru, and Don Heck, and a striking cover from the combined talents of Don Heck, John Romita, John Verpoorten, and Frank Giacoia, this issue promises both a courtroom drama among mutantkind and a bonus story featuring some of the X-Men's mightiest foes as jury.