Occurence: The Incredible Hulk #225

The Leader is wearing a pair of kinetic gloves against the Hulk which basically reflect the person's strength right back at them so they should never be able to defeat the glove. The Hulk exerts with all his strength and after about three minutes, his strength increases so much, he is able to overcome the gloves, much to the amazement of the Leader.

Hulk's Strength Feats

Incredible Feats of the Hulk Main Page