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13 TV shows that have gone through drastic cast changes

INSIDER Logo By Anjelica Oswald of INSIDER | Slide 1 of 14:  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.

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.

© ABC

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