Collects Avengers (1963) #77-97; Incredible Hulk (1968) #140. Roy Thomas' epic run continues with the origin of the Black Panther, the debut of the Lady Liberators, the return of the Squadron Sinister and the all-time classic Kree/Skrull War! Caught in a cosmic crossfire, Earth has become the staging ground for a conflict of star-spanning proportions! Two eternal intergalactic enemies — the merciless Kree and the shape-shifting Skrulls — have gone to war, and our planet is situated on the front lines! Can Earth's Mightiest Heroes bring about an end to the fighting before humanity becomes a casualty of war? And what good are even a dozen super-powered champions against the vast military machines of two of the greatest empires in the cosmos?