Who is the Hulk archenemy?

The Hulk's arch-enemy is generally considered to be the Leader (Samuel Sterns), a gamma-powered super-genius who serves as the intellectual foil to the Hulk's raw strength. However, General Thaddeus 'Thunderbolt' Ross is arguably the most persistent thorn in the Hulk's side, having relentlessly hunted Bruce Banner for decades. The Abomination (Emil Blonsky), another gamma-powered brute who is physically stronger than the Hulk in his base form, is also a major recurring nemesis. Each of these characters has a strong claim to the title depending on whether you're looking for a mental, personal, or physical rival to the Green Goliath.