William Shatner

Narrator

Edward Teller

Self - Nuclear Physicist

W.H.P. Blandy

Self - Commander Joint Task Force One (archive footage)

Frank H. Shelton

Self - Nuclear Weaponeer

Dwight D. Eisenhower

Self - U.S. President (archive footage)

Adlai Stevenson

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

Randall William Cook

Newsreel Narrator (archive sound)

Nikolai Bulganin

Self (archive footage)

Winston Churchill

Self (archive footage)

Everett Dirksen

Self (archive footage)

Albert Einstein

Self (archive footage)

Enrico Fermi

Self (archive footage)

Reed Hadley

Self (archive footage)

Averell Harriman

Self (archive footage)

Adolf Hitler

Self (archive footage)

Peter Kuran