X-Men: The Early Years #9

In "Enter, the Avengers!", the X-Men race to stop a catastrophic threat in Bavaria, only to find the Avengers already on the scene—just as Xavier discovers Lucifer's deadly plan hinges on a thermal bomb tied to his heartbeat. With time running out and the fate of the world at stake, the two teams must set aside their differences, trusting the X-Men to handle the crisis. Written by Stan Lee and illustrated by Jack Kirby with inks by Chic Stone, colors by Christie Scheele, and letters by Sam Rosen, this pivotal issue features a striking cover by Carlos Pacheco and Cam Smith.