Take a look back at some of the more memorable casting changes in the history of television.
Jimmy Smits stepped in to play Det. Bobby Simone and hung around for five seasons. It would hardly be the last casting change for the show, which saw Mark-Paul Gosselaar and Ricky Schroeder step in for stints opposite series mainstay Dennis Franz.
Russian Federal Space Agency
John Stillwell/Royal Family
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From Family Photos/CNN
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