The celebrated star played P.J.

The actress played Dr. Ellis Grey in a 2010 flashback episode, depicting Meredith’s mother during her residency.

He visits the hospital after getting attacked by a lion belonging to his girlfriend.

Leslie Odom, Jr.

ABC

Rita Moreno

Rita Morenobrought her star power toGrey’sin the 12th season.

She portrayed Gayle, a woman visiting her cheating husband in the hospital.

Lowes played an unnamed blood donor.

Sarah Paulson

ABC

She played the daughter of a woman with a delicate condition who becomes obsessed with her mother’s care.

He played Jake Burton, a patient with a unique condition that makes him look like a lion.

Keke Palmer

Keke Palmerpicked up a one-episode gig onGrey’s Anatomyin 2014.

Demi Lovato

Mitch Haddad/ABC via Getty Images

Her character was one of the hospital’s first powerhouse surgeons who returns for a procedure.

She played a patient undergoing a liver transplant.

Kurt Fuller

Kurt Fulleradded to his extensive filmography in 2007 with an episode ofGrey’s Anatomy.

Danny Strong

ABC

He played Jerry, a patient with an extensive run of bad luck.

Annie Potts

Veteran starAnnie Pottsdropped in onGrey’s Anatomy’s 10th season in 2013.

She played Joyce Bosco, a woman at the hospital with her husband.

Rita Moreno

ABC

Ethan Embry

Ethan Embryappeared in a 2012 episode ofGrey’sas Dr. David Moore.

He played a doctor who worked with Arizona after the loss of her leg.

She played Courtney Hall, a pregnant patient who chats with the doctors about their taxes.

Katie Lowes

ABC

Weil played Allison Clark, a cancer patient who bonds with Izzie.

She would later return to Shondaland as Bonnie Winterbottom onHow to Get Away with Murder.

Mary Pat Gleason

Mary Pat Gleasonfound a spot in a 2013 episode ofGrey’s Anatomy.

Elisabeth Moss

ABC

The veteran actress played Marge Walker, a patient with one gnarly infection.

Jamie Chung

In 2010,Jamie Chungguest-starred onGrey’s Anatomyas Trina Paiz.

She found herself in the hospital after falling and cutting her ear.

Jesse Plemons

ABC

Natalie Cole

Famed performerNatalie Coleappeared in a 2006 episode ofGrey’s Anatomy.

She appeared as a therapist who works with Callie and Arizona.

Mary Lynn Rajskub

Mary Lynn Rajskubappeared in an episode ofGrey’s Anatomyin 2012.

Keke Palmer

ABC

The24actress portrayed Marion Steiner, a woman who contracts a parasite after traveling abroad.

He plays a man who visits the hospital with his hypochondriac wife.

Sara Gilbert

Sara Gilbertplayed a character named Kim Allen in a 2010 episode ofGrey’s Anatomy.

Faye Dunaway

Ron Tom/ABC

Jurnee Smollett

Jurnee Smollettpicked up a two-episode arc onGrey’s Anatomyin 2008.

Lee Majors

Lee Majorsmade his appearance onGrey’s Anatomyin 2011.

Audra McDonald

Amid herPrivate Practicerun,Audra McDonaldstopped byGrey’s Anatomyas Dr. Naomi Bennett.

Nia Vardalos

Colleen Hayes/ABC via Getty Images

Ernie Hudson

Ernie Hudsonmade an appearance in one 2011 episode ofGrey’s Anatomy.

She played a little girl who bonds with Alex over her inability to feel pain.

The teenager is bitter over her seemingly dire condition, but gets new hope thanks to Izzie.

Kurt Fuller

ABC

Mandy Moore

Mandy Mooredid a four-episode stint onGrey’s Anatomyin 2010.

TheThis Is Usactress played a woman named Mary Portman.

Bernadette Peters

Bernadette PetersjoinedGrey’s Anatomyfor two episodes in 2008.

Annie Potts

ABC

Veronica Cartwright

Veronica Cartwrightappeared as Lydia Ashford in two episodes ofGrey’s Anatomyin 2013.

She plays a patient in the hospital worried about her house’s state after a violent storm.

Christina Ricci

Christina Riccihit the small screen in 2006 for two tense episodes ofGrey’s Anatomy.

Ethan Embry

ABC

He played a soldier working on getting in fighting condition to return to the battlefield.

Casey Wilson

ABC

Liza Weil

ABC

Mary Pat Gleason

ABC

Jamie Chung

ABC

Natalie Cole

ABC

Rose Abdoo

ABC

Mary Lynn Rajskub

ABC

Doris Roberts

ABC

Josh Malina

ABC

Sara Gilbert

ABC

Jurnee Smollett

ABC

Lee Majors

ABC

Audra McDonald

Ron Tom/ABC

Ernie Hudson

ABC

Abigail Breslin

ABC

Mae Whitman

Michael Desmond/ABC

Mandy Moore

Danny Feld/ABC

Bernadette Peters

Scott Garfield/ABC

Veronica Cartwright

ABC

Bellamy Young

ABC

Christina Ricci

Peter “Hopper” Stone/ABC

Zach Gilford

ABC