Theodore Hall as Self (archive footage)

Joan Hall as Self

Joseph Albright as Self

Marcia Kunstel as Self

Daniel Axelrod as Self

J. Michael Wright as Ted Hall

Lucy Zukaitis as Joan Hall

Nicolas Eastlund as Savy Sax

Mickey O'Sullivan as FBI Agent McQueen

Tom Goodwin as FBI Agent 3

Zach Twardowski as Ed Hall

Olivia Piper as Young Ruthie

Enzo Inalsingh as Sax baby

Kate Marie Smith as Susan Sax

Leslie Groves as Self (archive footage) (uncredited)

J. Robert Oppenheimer as Self (archive footage) (uncredited)

Joseph E. Davies as Self (archive footage) (uncredited)

Walter Huston as Self (archive footage) (uncredited)

Ann Harding as Self (archive footage) (uncredited)

Manart Kippen as Self (archive footage) (uncredited)

Harry S. Truman as Self (archive footage) (uncredited)

Dwight D. Eisenhower as Self (archive footage) (uncredited)

Henry L. Stimson as Self (archive footage) (uncredited)

Joseph Stalin as Self (archive footage) (uncredited)

Paul Tibbets as Self (archive footage) (uncredited)

Julius Rosenberg as Self (archive footage) (uncredited)

Ethel Rosenberg as Self (archive footage) (uncredited)