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29 Celebs You Probably Forgot Were In "Grey's Anatomy"

Before starring in Mad Men and The Handmaid's Tale, Elisabeth Moss played Nina, a woman accompanying her sick mother to the hospital, on Grey's.

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1. Before she was Eleven on Stranger Things, Millie Bobby Brown played Ruby, a young girl who called the hospital after her mom was seriously injured:

Frazer Harrison / Getty Images, ABC

2. American Horror Story actor Sarah Paulson guest starred as a young Ellis Grey in a flashback episode:

Dimitrios Kambouris / Getty Images, ABC

3. Before he was listening to Hannah's tapes on 13 Reasons Why, Dylan Minnette played an adorable little boy waiting for an ear transplant:

Frazer Harrison / Getty Images, ABC

4. Before starring in Mad Men and The Handmaid's Tale, Elisabeth Moss played Nina, a woman accompanying her sick mother to the hospital, on Grey's:

Alberto E. Rodriguez / Getty Images, ABC

5. Thor: Ragnarok star Tessa Thompson guest starred as Richard's niece Camille, who passed out during her prom because of her ovarian cancer:

Frederick M. Brown / Getty Images, ABC

6. Long before This Is Us, Mandy Moore played Mary, a patient who helped Bailey try to save Charles during the hospital shooting:

Frazer Harrison / Getty Images, ABC

7. Hamilton star Leslie Odom Jr. played one of the patients undergoing the domino kidney transplant in Season 5:

Bryan Bedder / Getty Images, ABC

8. Parenthood star Mae Whitman guest starred as a character who was admitted to Seattle Grace with a spinal problem:

Alberto E. Rodriguez / Getty Images, ABC

9. Star Trek star John Cho played Marshall, an intern who gets into a car accident after falling asleep at the wheel:

Frazer Harrison / Getty Images, ABC

10. Scrubs alum Sarah Chalke joined Grey's for a powerful episode inspired by her son's real-life disease:

Alberto E. Rodriguez / Getty Images, ABC

11. Friday Night Lights and Fargo star Jesse Plemons played a character who checked into Seattle Grace with a brain tumor:

Alberto E. Rodriguez / Getty Images, ABC

12. Scream Queens alum Abigail Breslin guest starred as a young girl who was insensitive to pain in Season 3:

Frazer Harrison / Getty Images, ABC

13. Timeless and Pitch Perfect 3 star Matt Lanter guest starred as Adam, a high school football player with a spinal cord injury:

Bryan Bedder / Getty Images, ABC

14. American Horror Story and The 100 star Adina Porter played a neurosurgeon who was called to Seattle Grace after Derek suffered a hand tremor as a result of the plane crash:

Emma Mcintyre / Getty Images, ABC

15. Wet Hot American Summer alum Ken Marino played a patient who had been shot by his former employee in Season 2:

Angela Weiss / Getty Images, ABC

16. Iconic Ghostbusters star Ernie Hudson guest starred as a surgeon on a rival baseball team in Season 8:

Frederick M. Brown / Getty Images, ABC

17. Long before she started saving the world on The Flash, Danielle Panabaker played a patient on life support after her heart had to be removed:

Mike Coppola / Getty Images, ABC

18. Roseanne star Sara Gilbert played Kim, a patient with terminal cancer who decided to end her life with aid from a physician:

Kevin Winter / Getty Images, ABC

19. Before American Horror Story: Cult, Leslie Grossman played a woman with hypochondria who diagnosed herself with cancer:

Frazer Harrison / Getty Images, ABC

20. Friday Night Lights star Zach Gilford guest starred as an Army vet who made the painful decision to amputate his leg so that he could return to war:

Ilya S. Savenok / Getty Images, ABC

21. Long before Candice Patton was kicking ass on The Flash, she played a character with a knee injury on Grey's:

Mike Coppola / Getty Images, ABC

22. While she was running with werewolves on Teen Wolf, Holland Roden swung by Grey's and played the mother of conjoined twins in Season 8:

Christopher Polk / Getty Images, ABC

23. My So-Called Life and Star Trek: Discovery star Wilson Cruz guest starred as the fiancé of a patient admitted to the hospital on his wedding day:

Frazer Harrison / Getty Images, ABC

24. Scream Queens alum Keke Palmer played Sheryll, a patient who was hoping to be a part of Cristina’s heart surgery trial:

Earl Gibson III / Getty Images, ABC

25. Arrow star David Ramsey played a husband who accompanied his wife to the hospital after she had been shot in Season 6:

Mike Coppola / Getty Images, ABC

26. Before UnREAL, Constance Zimmer guest starred as Alana, a physician adviser who was brought in to help the hospital avoid bankruptcy:

Dia Dipasupil / Getty Images, ABC

27. Parenthood star Max Burkholder played Duncan, a little boy who needed heart surgery, in Season 5:

Valerie Macon / Getty Images, ABC

28. Teen Wolf and Pretty Little Liars alum Cody Christian played a boy whose father thought he was faking his severe stomach pain:

Mike Coppola / Getty Images, ABC

29. And finally, Liza Weil, Bellamy Young, Joshua Malina, Katie Lowes, Jeff Perry, and Scott Foley all guest starred in episodes of Grey's before going on to star in Scandal:

Alberto E. Rodriguez / Getty Images / ABC, Emma Mcintyre / Getty Images / ABC, Nicholas Hunt / Getty Images / ABC, Emma McIntyre / Getty Images / ABC, Matt Winkelmeyer / Getty Images / ABC

Liza Weil has actually starred in Grey's Anatomy, Private Practice, Scandal, and How to Get Away With Murder.

Correction: A previous version wrongly identified Abigail Breslin's character's symptoms. There's 14 seasons, y'all — we aren't perfect.

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