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.
Library of Congress
iStock / amete
iStock / LawrenceSawyer
Wisconsin Dept. of Natural Resources
Enrique Castro-Mendivil / Reuters
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