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\"Are we saying there's a chance that when we push that button, we destroy the world?\" Groves asks, to which Oppenheimer responds, \"The chances are near zero.\"

\"Near zero?\" Groves asks, incredulous.

\"What do you want from theory alone?\" Oppenheimer replies.

\"PHOTO:
Universal Pictures
PHOTO: Matt Damon is seen in a still from the upcoming film "Oppenheimer."
>

\"Zero would be nice,\" Groves says.

As the tension ratchets up, Oppenheimer pledges, \"Our work here will ensure peace mankind has never seen.\"

The trailer closes with Kenneth Branagh's character telling Oppenheimer, \"You are the man who gave them the power to destroy themselves. And the world is not prepared.\"

The film also stars Gary Oldman as President Harry Truman, Emily Blunt as Oppenheimer's wife Kitty Oppenheimer, Rami Malek as a scientist, Robert Downey Jr. as former Commerce Secretary Lewis Strauss, Jack Quaid as physicist Richard Feynman, Florence Pugh as Jean Tatlock, and Matthew Modine as Vannevar Bush.

\"PHOTO:
Universal Pictures
PHOTO: Emily Blunt is seen in a still from the upcoming film "Oppenheimer."
>

\"Oppenheimer\" debuts in theaters July 21.

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