Occurence: Tales to Astonish #73

Before sending the Hulk off to the Watcher's planet, the Leader tests the Hulk's strength. He doesn't have any equipment that can even come close to measuring the Hulk's strength. He also uses electrodes, freezing temperature, and high velocity, all to no effect.

Hulk's Strength Feats

Incredible Feats of the Hulk Main Page