The Avengers battle the Defenders in comics' first great crossover battle royale. It's hero against hero in the sensational summer hit of 1973: Cap vs. Namor, Thor vs. Hulk. It's the original, and there's never been another one like it. All this, plus the origin of Mantis; an all-hands-on-deck battle with the Zodiac; the Avengers vs. Thanos and the Cosmic Cube; a Giant-Size adventure alongside Golden Age heroes Miss America and the Whizzer; the wedding of Quicksilver and Crystal; the return of Ultron; and an increasingly tense love triangle between the Scarlet Witch, the Vision and Mantis. Collecting AVENGERS (1963) #115-128, GIANT-SIZE AVENGERS (1974) #1, DEFENDERS (1972) #8-11, CAPTAIN MARVEL (1968) #33 and FANTASTIC FOUR (1961) #150.