The documentary tells the story of J. Robert Oppenheimer (1904-1967), the theoretical physicist who led the effort to build the first atomic bomb, tested in July 1945 at the Trinity site in New Mexico. When theoretical physicist J. Robert Oppenheimer became director of the Manhattan Project, he brought with him a love of poetry, philosophy, and Eastern religion. In the years following Trinity, the classified maiden test of a prototype atomic bomb, Oppenheimer revealed himself as a thoughtful man who felt both a duty to his country and a deep regret for the death and destruction caused by his leadership in the development of the weapon that heralded the arrival of the Atomic Age. It features interviews with several Manhattan Project scientists, as well as newly declassified archival footage. The film's title comes from an interview seen near the conclusion of the documentary. Robert Oppenheimer is asked for his thoughts on Sen. Robert Kennedy's efforts to urge President Lyndon Johnson to initiate talks to stop the spread of nuclear weapons. "It's 20 years too late," Oppenheimer replies. After a pause he states, "It should have been done the day after Trinity."