After over 300 aired episodes, "Grey's Anatomy" has become the second-longest-running medical drama. Many remarkable guest stars have walked the halls of Grey Sloan Memorial Hospital, some more unforgettable than others.
Some of these you may remember, but others will shock you! After releasing its 16th season, let's take a look at some of those faces.
1. Demi Lovato
2. Millie Bobby Brown
ABC
3. Mandy Moore
4. Abigail Breslin
ABC
5. Hilarie Burton
6. Scott Foley
7. Liza Weil
8. Dylan Minnette
ABC
9. William Daniels
ABC
10. Matthew Morrison
ABC
11. Bethany Joy Lenz
ABC
12. Josh Radnor
ABC
13. Alyssa Milano
ABC
14. Holly Marie Combs
ABC
15. Sarah Chalke
ABC