Television shows can go through some drastic changes as their runs increase.
As original cast members leave and new cast members join, the show can look a lot different from when it started. That includes shows like "Grey's Anatomy," which only has four original cast members remaining. Other shows are made to constantly change, like "Doctor Who."
Here are 13 shows that have gone through some drastic cast changes over their runs.
"Once Upon a Time" went through drastic changes after its sixth season.
Six longtime cast members left the show before the seventh season: Snow White (Ginnifer Goodwin), Prince Charming (Josh Dallas), Emma Swan (Jennifer Morrison), Henry (Jared Gilmore), Belle (Emilie de Ravin), and Zelena/The Wicked Witch (Rebecca Mader). Some of them did return for at least one episode. But the show added a slew of new characters to the cast, including Andrew J. West as an older Henry.
None of the original cast of "Law and Order" made it to the end of the show.
Six main actors were featured during the police drama's first season. Of those six, Steven Hill lasted the longer. The actor didn't leave until season 10. S. Epatha Merkerson joined during season four and lasted through the end of the 20 seasons. Sam Waterston joined during season five and also lasted until the end.
Mariska Hargitay is the only cast member of "Law and Order: Special Victim's Unit" to star on the show since season one.
Ice-T, who joined on season two, is the only other actor to stick around for roughly the whole show. Christopher Meloni, who played Elliot Stabler, was Hargitay's partner and left during season 12. Both Richard Belzer and Dann Florek started on season one and left during season 15. Now on season 19, the detective drama has added some new officers and district attorneys to the cast.
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