X-Men #66 (1963 1st Series)

Cover pencils by Marie Severin, inks by Sam Grainger. The Mutants and the Monster, script by Roy Thomas, pencils by Sal Buscema, inks by Sam Grainger; With Professor X in a coma after warding off the Z'Nox, the X-Men try to reach him and he mentally tells them one word, "Hulk"; The X-Men track down the jade giant and Jean's mental powers cause him to revert to Bruce Banner; Banner tells them that he has a machine that may save Xavier but Major Talbot shows up and causes him to transform to the Hulk again; The X-Men follow him into the desert and battle him at the site of an old lab where they are able to procure the piece of machinery that brings Professor X out of his coma; "And they fought happily ever after...??"