Characters played by Helen Caldicott
Self
Characters played by Vannevar Bush
Self - In front of map of Japan
Characters played by Winston Churchill
Self
Characters played by Leslie Groves
Self - In front of map of Japan
Characters played by Ronald Reagan
Self
Characters played by Franklin D. Roosevelt
Self
Characters played by Richard Tolman
Self - In front of map of Japan
Characters played by Harry S. Truman
Self
Characters played by Clement Attlee
Self - at Potsdam
Characters played by Ernest Bevin
Self - at Potsdam
Characters played by James Byrnes
Self - at Potsdam
Characters played by Ed Herlihy
Universal Newsreel Narrator
Characters played by Ernest O. Lawrence
Self - with Cyclotron Controls
Characters played by William D. Leahy
Self - at Potsdam
Characters played by Vyacheslav Molotov
Self - at Potsdam
Characters played by Joseph Stalin
Self - at Potsdam