When Stan Lee turned the super-hero world on its head replacing Avengers founders Iron Man, Thor, Giant-Man and the Wasp with a trio of former super villains, readers thought he'd gone mad. As it turned out the only thing crazy was how insanely exciting the line-up of Captain America, Hawkeye, Quicksilver and the Scarlet Witch would become! The hits continued with the fi rst appearance of the Collector, the Swordsman and the Sons of the Serpent, the Black Widow's Avengers debut and Giant-Man's transformation into Goliath. Despite the unbelievable heights the Avengers had reached under Lee, when he passed the title to Roy Thomas, the sky was the limit!COLLECTING: VOL. 2; AVENGERS (1963) 21-40