John Nesbitt
Narrator (voice)

Roger Moore
Man Examining Film Strip (uncredited)

Emmett Vogan
Lab Assistant (uncredited)

Franz Ferdinand von Österreich-Este
Self (archive footage)

Winston Churchill
Self (archive footage)

King Edward VIII of the United Kingdom
Self (archive footage)

Kaiser Wilhelm II of Germany
Self (archive footage)

William McKinley
Self (archive footage)

Theodore Roosevelt
Self (archive footage)

William Howard Taft
Self (archive footage)

King Manoel II
Self (archive footage)

King George VI of the United Kingdom
Self (archive footage)

King George V of the United Kingdom
Self (archive footage)

King Alfonso XIII of Spain
Self (archive footage)

King Albert I
Self (archive footage)