6. Dr Erskines Super Serum
Marvel StudiosDr Erskine's serum in Captain America: The First Avenger turned Steve Rogers from scrawny child to muscled warrior, and had wide ranging implications on the Marvel Cinematic Universe; Bruce Banner was attempting to emulate the serum when he was given his powers. The Abomination was born through an emulated serum. Within the Marvel Cinematic Universe Cap has been immensely influential, so the serum demands to be recognised as a feat of genius that cannot be understated. Without the serum Captain America would not have existed, the Hulk would not have been created, The Avengers would not have been mobilised, and arguably Howard Stark and Peggy Carter would not have created SHIELD. Clearly this serum had such a wide ranging impact that it is hard to imagine the Marvel Cinematic Universe without Dr Erskine's secret super serum.