X-Men (1963) 66-B

"The Mutants and the Monster"

With the Z'Nox defeated and Earth safe, the X-Men turn their attention to a comatose Professor X as tempers flare up. Beast tries to reach the Professor using the mind probe but all the Professor is thinking about is the Hulk. Jean tries to contact him, but again all he projects is the Hulk. So the team goes looking for the mammoth monster. They manage to stop the rampaging Hulk and get him to turn back into Bruce Banner, but Major Talbot arrives and wants the Hulk, who escapes but leads the X-Men to the device needed to rescue Professor X.

Last original X-Men story before reprints begin.