Originally published in magazine form as Avengers #115-128 & Giant size #1, Defenders #8-11, Captain Marvel #33 and Fantastic Four #150.

The Avengers battle the Defenders in comics' first great crossover battle royal! 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. Also featuring 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 including the Golden Age heroes Miss America and the Whizzer; the wedding of Quicksilver and Crystal; the return of Ultron; and the increasingly tense love triangle emerging between the Scarlet Witch, the Vision and Mantis! And as an added bonus feature we're including rare Avengers pinups, profi les and more from the pages of the '70s fanzine F.O.O.M.! COLLECTING: AVENGERS (1963) 115-128, GIANT-SIZE (1974) 1, DEFENDERS (1972) 8-11, CAPTAIN MARVEL (1968) 33, FANTASTIC FOUR (1961) 150