Pretty much all of the Planet Hulk episode, once the Hulk steps into the arena.
The mayor trying to talk down Dark Surfer fails, but he's the only hero to attempt anything until the Squad shows up. And he has no powers to boot!
Thor punching the Executioner through several buildings in "Mental Organism Designed Only for Kissing" without his hammer!
The minute Hulk drops the fractal that made him smart in "Hulk Talk Smack", he curb-stomps every villain in his path. Special mention goes to him slingshooting the Toad by his tongue into the side of a canyon.