Take a look back at some of the more memorable casting changes in the history of television.
Ashton Kutcher, no stranger to TV sitcoms thanks to his run on "That '70s Show," stepped into the hole left by Sheen's firing, playing Internet billionaire Walden Schmidt.
Enrique Castro-Mendivil / Reuters
U.S. National Archives
REUTERS/ Stefano Rellandini
U.S. Air Force
iStock / damircudic
Warner Bros. Television
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