An all-time cosmic classic and one of the most important Marvel stories ever told! The galaxy is rocked by a conflict of star-spanning proportions - with Earth caught in the crossfire! The eternal intergalactic enemies, the merciless Kree and the shape-changing 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 great empires of the cosmos? The key to victory lies with the expatriate Kree Captain Mar-Vell and his human host, honorary Avenger Rick Jones!

Collecting AVENGERS (1963) #89-97.