Earth's Mightiest Heroes begin to unravel the origin of Mantis in their latest Masterworks extravaganza! An all-hands-on-deck battle with the Zodiac takes the Avengers to the stars and into the jungles of Vietnam before Mantis' surprise connection to the criminal gang is revealed. Then, the team lends their might to Captain Marvel's fight against Thanos and his Cosmic Cube! Next, Roy Thomas returns for a Giant-Size adventure including Golden Age heroes Miss America and the revelation about Quicksilver and the Scarlet Witch's origins. Collecting Avengers (1963) #120-128, Giant -Size Avengers #1, Captain Marvel (1968) #33, and Fantastic Four (1961) #150.