Four episodes of the M.A.D World series trace the first fifteen years of the atomic age, from the Manhattan Project's race to build a bomb to the Cuban Missile Crisis. Archival footage and expert interviews walk through Robert Oppenheimer's Los Alamos laboratory, the Trinity test, and the decision to drop a weapon equal to 20,000 tons of TNT on Hiroshima, leveling the city and unleashing radiation sickness that outlasted the blast itself. The series follows how the Soviet Union raced to match American power, turning a wartime alliance into a standoff built on mutually assured destruction, the doctrine that gives the series its name. Newsreels, declassified documents, and historian commentary track the arms buildup through the 1950s into 1962, when Soviet missiles in Cuba brought both superpowers to the edge of launching. Rather than treating the bomb as a single event, the series builds a chronology of decisions, tests, and near-misses that turned one weapon into a permanent global threat.