They are the Earth's Mightiest Heroes and greatest Defenders. They have thwarted the attacks of aliens, monsters and even gods. But now, they face their greatest foe: each other! Loki, the Avengers' first and greatest enemy, has teamed with Dormammu, Master of the Dark Arts, to rebuild the shattered Evil Eye -- enabling the Dark Dimension to expand until it finally is able to swallow the Earth and rid the evil pair of their enemies - forever!  But trust between enemies is rare. And soon, each has recruited his former foes as allies. As the Avengers attempt to devise a way to stop the Defenders from succeeding in Dormammu's quest, the Defenders accuse the Avengers of acting under the control of Loki. What follows is a battle between two of comics' most popular super-hero teams! Witness the super-powered match-ups of: Hawkeye vs. Iron Man, Namor vs. Captain America, Hulk vs. Thor, Silver Surfer vs. Vision and Scarlet Witch! COLLECTING Avengers (1963) #115-118, Defenders (1972) #8-11.