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.
Wisconsin Dept. of Natural Resources
Enrique Castro-Mendivil / Reuters
Gene Blevins / Reuters
Patrick T. Fallon/Reuters
Larry Downing / Reuters
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