Cast of Fat Man and Little Boy

Paul Newman portrays General Leslie R. Groves, the military leader overseeing the Manhattan Project, responsible for the development of the atomic bomb.

Dwight Schultz takes on the role of J. Robert Oppenheimer, the brilliant scientist and director of the Los Alamos Laboratory, who played a crucial role in the development of the atomic bomb.

Bonnie Bedelia plays Kitty Oppenheimer, the wife of J. Robert Oppenheimer, providing insight into the personal and emotional struggles within the scientific community during this intense period.

John Cusack portrays Michael Merriman, a fictional character representing the scientists involved in the Manhattan Project, showcasing the moral dilemmas faced by those working on the atomic bomb.

Laura Dern takes on the role of Kathleen Robinson, offering a perspective on the impact of the atomic bomb development on the families and loved ones of the scientists involved.

Ron Frazier plays Peter de Silva, a character demonstrating the diverse backgrounds and roles within the Manhattan Project team, highlighting the collaborative efforts required for such a monumental scientific undertaking.

John C. McGinley portrays Richard Schoenfield, representing the tensions and conflicts that arose among the scientists and military personnel involved in the Manhattan Project.

Natasha Richardson plays Jean Tatlock, a character symbolizing the complex relationships and personal connections within the scientific community during this pivotal period.

Ron Vawter takes on the role of Jamie Latrobe, offering a perspective on the ethical and philosophical debates surrounding the development and use of the atomic bomb.

Michael Brockman portrays William 'Deke' Parsons, a military officer involved in the Manhattan Project, highlighting the coordination between the military and scientific personnel during the atomic bomb development.

Del Close plays Dr. Kenneth Whiteside, showcasing the scientific expertise and contributions of various researchers and specialists involved in the Manhattan Project.

John Considine takes on the role of Robert Tuckson, representing the administrative and logistical challenges faced by the support staff and organizers of the Manhattan Project.