温斯顿·伦纳德·斯宾塞·丘吉尔
Winston Churchill
饰：Himself - Finest Hour Speech (archive sound) (uncredited)
德怀特·戴维·艾森豪威尔
Dwight D. Eisenhower
饰：Himself - Announces Landing in Normandy (archive sound) (uncredi
Nelson Rockefeller
饰：Himself - Eulogizes Sarnoff (archive footage) (uncredited)
奥逊·威尔斯
Orson Welles
饰：Professor in War of the Worlds Broadcast (archive sound) (uncred
法兰克·阿尔伯特·辛纳屈
Francis Albert Sinatra
饰：Himself - Serenades Sarnoff (archive footage) (uncredited)
约翰·巴里摩尔
John Barrymore
饰：Hamlet (archive sound) (uncredited)
Franklin Delano Roosevelt
Franklin Delano Roosevelt
饰：Himself - Makes Broadcast About Banking Reform (archive footage)
Ralph Edwards
饰：Himself - Host of 'This Is Your Life' (archive footage) (uncredi
弗雷德·艾伦
Fred Allen
饰：Himself - Predicts Demise of Radio (archive footage) (uncredited
哈里·S·杜鲁门
Harry S. Truman
饰：Himself - Announces Bombing of Hiroshima (archive sound) (uncred
玛丽·莫斯奎尼
Marie Mosquini
饰：Herself - with Lee De Forest (archive footage) (uncredited)
加里森·凯勒尔
Garrison Keillor
饰：Himself - Writer
吉恩·奥特里
Gene Autry
饰：Himself - Sings (archive sound) (uncredited)
诺曼·科温
Norman Corwin
饰：Himself - Writer
Red Barber
饰：Himself - Radio Announcer
Frank Günther
Frank Günther
饰：Himself (engineer)
Charles J. Correll
饰：Himself - Prepares for Amos 'n' Andy Broadcast (archive footage)
Freeman F. Gosden
饰：Himself - Prepares for Amos 'n' Andy Broadcast (archive footage)
阿图罗·托斯卡尼尼
Arturo Toscanini
饰：Himself - Conducts NBC Symphony (archive footage) (uncredited)
Bob Warren
Bob Warren
饰：This is Your Life Announcer Dr. Lee DeForrest episode (uncredite
David Sarnoff
David Sarnoff
饰：Himself - with Marconi at RCA (archive footage) (uncredited)
Guglielmo Marconi
Guglielmo Marconi
饰：Himself - Visits Sarnoff at RCA (archive footage) (uncredited)
李·德·弗雷斯特
Lee De Forest
饰：Himself - Objects to Quality of Radio Programming (archive foota
Gertrude Tyne
Gertrude Tyne
饰：Herself - Engineer
Dana Raymond
饰：Himself - Friend of Edwin H. Armstrong
Robert Morris
Robert Morris
饰：Himself - Engineer
Helen Kelley
Helen Kelley
饰：Herself - Radio Broadcaster
Loren Jones
Loren Jones
饰：Himself - Engineer
Jeanne Hammond
Jeanne Hammond
饰：Herself - Niece of Edwin H. Armstrong
Susan Douglas
Susan Douglas
饰：Herself - Historian
Ken Bilby
Ken Bilby
饰：Himself - Biographer of David Sarnoff
Erik Barnouw
饰：Himself - Historian
杰森·罗巴兹
Jason Robards
饰：Narrator
杰森·罗巴兹
Jason Robards
饰：自己