威廉·夏特纳

William Shatner

饰：Narrator

阿尔伯特·爱因斯坦

Albert Einstein

饰：Himself (archive footage)

约翰·肯尼迪

John F. Kennedy

饰：Himself (archive footage)

Edward Teller

饰：Himself (also archive footage) (as Dr. Edward Teller)

Frank H. Shelton

Frank H. Shelton

饰：Himself (as Dr. Frank H. Shelton)

兰德尔·威廉·库克

Randall William Cook

饰：Newsreel Narrator

W.H.P. Blandy

饰：Himself (archive footage) (as Vice Admiral W.H.P. Blandy)

Nikolai Bulganin

Nikolai Bulganin

饰：Himself (archive footage)

温斯顿·伦纳德·斯宾塞·丘吉尔

Winston Churchill

饰：Himself (archive footage)

Everett Dirksen

饰：Himself (archive footage)

德怀特·戴维·艾森豪威尔

Dwight D. Eisenhower

饰：Himself (archive footage)

里德·哈德利

Reed Hadley

饰：(archive footage)

Averell Harriman

饰：Himself (archive footage)

休伯特·汉弗莱

Hubert H. Humphrey

饰：Himself (archive footage)

尼基塔·谢尔盖耶维奇·赫鲁晓夫

Nikita Khrushchev

饰：Himself (archive footage)

Anastas Mikoyan

Anastas Mikoyan

饰：Himself (archive footage)

玛丽莲·梦露

Marilyn Monroe

饰：Herself (archive footage)

罗伯特·奥本海默

J. Robert Oppenheimer

饰：Himself (archive footage)

Franklin Delano Roosevelt

Franklin Delano Roosevelt

饰：Himself (archive footage)

Dean Rusk

Dean Rusk

饰：Himself (archive footage)

Adlai Stevenson

饰：Himself (archive footage)

Leo Szilard

Leo Szilard

饰：Himself (archive footage)

保罗·提贝兹

Paul Tibbets

饰：Himself (archive footage)

Wernher von Braun

饰：Himself (archive footage)

Roy Neal

Roy Neal

饰：Himself (uncredited)

Enrico Fermi

饰：Himself

富兰克林·德拉诺·罗斯福

Franklin D. Roosevelt

饰：自己

Woodrow P. Swancutt

饰：Self,(archive footage)

Mark Tapscott

饰：Announcer,(archive footage)