Uncanny X-Men #108 Dec 1977
"Where No X-Man has Gone Before!" Part 3 of 3. Guest-starring the Starjammers.
On the far side of the universe alone and cut off from their mentor, the X-Men must face their worst nightmares if they are going stop the mad Emperor D'Ken,
from unleashing the unimaginable power of the M'Krann Crystal upon the universe.
NOTE: This issue marks the first of a long and distinguished run by one of the greatest creative teams ever assembled - Chris Claremont, John Byrne, and Terry Austin.
Over the course of the next 36 issues they will go on to tell some of the most prominent X-Men stories. Stories that still resonate to this day.
Story by Chris Claremont.
Art by John Byrne and Terry Austin.