The angrier he gets, the stronger he gets—and Bruce Banner's gamma-irradiated alter ego has gotten angry enough to crack continents and punch through dimensions. The Hulk's strength has literally no known upper limit, he regenerates from virtually any wound, and his thunderclap can level city blocks. The only thing scarier than fighting the Hulk is the realization that he hasn't even started trying yet.

Bitten by a radioactive spider and burdened with more responsibility than any teenager should carry, Peter Parker became the wisecracking wall-crawler known as Spider-Man. His spider-sense grants near-precognition in combat, and he can bench-press ten tons while dodging bullets with acrobatic flair. The smartest mouth in the Marvel Universe, backed by a genius-level intellect.