Narrator

William Shatner

Acting

Self - Nuclear Physicist

Edward Teller

Acting

Self - Commander Joint Task Force One (archive footage)

W.H.P. Blandy

Acting

Self - Nuclear Weaponeer

Frank H. Shelton

Acting

Self - U.S. President (archive footage)

Dwight D. Eisenhower

Acting

Self - U.S Ambassador (1961-1965) to the UN (archive footage)

Adlai Stevenson

Acting

Newsreel Narrator (archive sound)

Randall William Cook

Visual Effects

Self (archive footage)

Nikolai Bulganin

Acting

Self (archive footage)

Winston Churchill

Acting

Self (archive footage)

Everett Dirksen

Acting

Self (archive footage)

Albert Einstein

Acting

Self (archive footage)

Enrico Fermi

Acting

Self (archive footage)

Reed Hadley

Acting

Self (archive footage)

Averell Harriman

Acting

Self (archive footage)

Adolf Hitler

Acting

Self (archive footage)

Hubert H. Humphrey

Acting

Self (archive footage)

John F. Kennedy

Acting

Self (archive footage)

Никита Хрущёв

Acting

Self (archive footage)

Анастас Микоян

Acting

Self (archive footage)

Marilyn Monroe

Acting

Self (archive footage)

J. Robert Oppenheimer

Acting

Self (archive footage)

Franklin D. Roosevelt

Acting

Self (archive footage)

Dean Rusk

Acting

Self (archive footage)

Woodrow P. Swancutt

Acting

Self (archive footage)

Leó Szilárd

Acting

Announcer (archive footage)

Mark Tapscott

Acting

Self (archive footage)

Paul Tibbets

Acting

Self (archive footage)

Wernher von Braun

Acting

Self (archive footage)

John von Neumann

Acting

Self (archive footage)

Mao Zedong

Acting

Self (uncredited)

Roy Neal

Acting