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.

Born Kal-El on the doomed planet Krypton, Superman is the gold standard against which all other heroes are measured. Powered by Earth's yellow sun, he possesses near-limitless strength, heat vision that can cut through dimensions, and speed that rivals the Flash. His only real weakness is a glowing green rock—and even that barely slows him down.