Powerful pawns in a game of gods! Captain America vs. the Sub-Mariner! Thor vs. the Hulk! The Swordsman vs. the Valkyrie! These and other matches comprised the Silver Age's most sensational clash of costumed champions - but whoever wins the war, Dormammu and Loki are prepared to make Earth the loser! Collecting AVENGERS (1963) #115-118 and DEFENDERS (1972) #8-11.