Day One
Hungarian physicist Leo Szilard leaves Europe, eventually arriving in the United States. With the help of Einstein, he persuades the government to build an atomic bomb. The project is given to no-nonsense Gen. Leslie Groves who selects physicist J. Robert Oppenheimer to head the Los Alamos Laboratory in New Mexico, where the bomb is built. As World War II draws to a close, Szilard has second thoughts about atomic weapons, and policy makers debate how and when to use the bomb.
Top cast
Brian DennehyGen. Leslie Groves
David StrathairnJ. Robert Oppenheimer
Michael TuckerLeo Szilard
Hume CronynJames F. Byrnes
Richard DysartPresident Harry S. Truman
Hal HolbrookGen. George Marshall
Barnard HughesHenry Stimson
John McMartinDr. Arthur Compton
David Ogden StiersFranklin D. Roosevelt
Anne TwomeyKitty Oppenheimer
Lawrence Dane
Ron FrazierColonel Pash
Below are the streaming services currently carrying the movie “Day One” in Canada, along with how each offers it (subscription, buy, or rent) and a direct link. Licensing differs by market, so availability in Canada can differ from other countries.
Where to watch Day One in Canada
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Not currently available on the supported providers in Canada.
Availability can change as licenses rotate — confirm on the provider’s page before subscribing. Last checked: 14 Sept 2026.