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You can buy "Fat Man and Little Boy" on Vudu, Microsoft Store, Apple TV, Amazon Video, Google Play Movies, YouTube as download or rent it on Vudu, Microsoft Store, Amazon Video, Apple TV, Google Play Movies, YouTube online.
Assigned to oversee the development of the atomic bomb, Gen. Leslie Groves is a stern military man determined to have the project go according to plan. He selects J. Robert Oppenheimer as the key scientist on the top-secret operation, but the two men clash fiercely on a number of issues. Despite their frequent conflicts, Groves and Oppenheimer ultimately push ahead with two bomb designs — the bigger "Fat Man" and the more streamlined "Little Boy."