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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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

ABC

ABC

ABC

ABC

ABC

ABC

ABC

ABC

ABC

ABC

ABC

ABC

Ron Tom/ABC

ABC

ABC

Michael Desmond/ABC

Danny Feld/ABC

Scott Garfield/ABC

ABC

ABC

Peter “Hopper” Stone/ABC

ABC