I've been watching Law and Order since the beginning, but looking back there were a lot of famous faces that made an appearance on the original, as well as Law and Order: SVU.
Before she was an Emmy-winning actress, the American Horror Story actress got her first on-screen credit as a 14-year-old girl named Maggie Conner, who was investigated for the murder of her mother.
The Once Upon a Time actress appeared in one episode of Law and Order in 2001 as a woman named Erica.
Now known as a human rights activist and Sophia Bursett on Orange Is The New Black, Cox appeared on Law and Order playing a character named Minnie.
This Heroes and Nashville star appeared in season 2 of Law and Order: SVU as a child who intentionally hurts herself to get attention from her parents. She appeared again in season 6 as a high school prostitute who kills her doctor.