Occurence: Avengers #40 (Vol 3)

A whole town of people are changed into Hulk-like creatures and fight the Avengers. During the battle, all the Hulk-creatures merge and form one gigantic Hulk-creature. The Avengers get the Hulk for help who allows himself to merge with the Hulk-creature. The Hulk's mind and will are so strong that he overpowers the collective minds of the entire town and forces the gigantic Hulk-creature to break back apart.

Hulk's Mental Resistance Feats

Incredible Feats of the Hulk Main Page