Kate Walsh Is Returning to "Grey's Anatomy" — Plus All These New Characters Joining Season 19

Shum joins the cast as Daniel "Blue" Kwan, one of several new surgical residents arriving at Grey Sloan. His official character bio, as reported by Deadline, describes him as "sharp-witted, impatient and brilliant. He is generous by nature but competitive to a fault, naturally gifted, and used to winning at everything. A family crisis interfered with his career plans, and now he's got a lot to prove."

Before joining the "Grey's" family, Shum's small-screen roles included talented dancer Mike Chang on "Glee" and warlock Magnus Bane on "Shadowhunters." He also plays Charlie Wu in the "Crazy Rich Asians" film series, and is set to co-lead a spinoff movie with co-star Gemma Chan.

Kane, best known for her role as Mary, Queen of Scots, on "Reign," joins the cast as Jules Millin. Per her official character description, Jules "was raised by drug-addled artist/hippies and somehow emerged as the only real grown-up in the family. Because she always had to take care of herself and her parents, Jules can be a little bossy — but her heart is always in the right place. She's not afraid to break the rules to save a life, and sometimes it gets her in trouble." According to a first-look sneak peek posted on the official Twitter, it looks like Jules also has a previous connection with Atticus "Link" Lincoln.

Aside from her starring role on "Reign," Kane also played "wicked stepsister" Ivy on "Once Upon a Time," and more recently played Rebecca Bowen on "SEAL Team."

Terho is set to play Lucas Adams, another of the new class of first-year surgical residents. His character description depicts him as "the charming black sheep of his family. Likable to a fault, he has a great mind, but doesn't have the grades to match. He's determined to prove himself as a surgeon, just like many in his family that have come before him, but he will have to stop relying on his people skills and put in the work."

Terho already has one connection to "Grey's": he co-starred with Jake Borelli (aka Levi Schmitt) in the 2020 rom-com "The Thing About Harry."

Floyd is also part of the new "class" of residents, playing Simone Griffin. Her character's backstory is especially intriguing: "A funny, whip-smart, high achiever with a complicated family dynamic. She grew up in Seattle, but never wanted to work at Grey Sloan because of a painful personal history with the hospital."

Floyd is already part of the Shondaland family, having played "Neff" (a fictionalized version of Neffatari Davis, a concierge at NYC hotel 11 Howard) in "Inventing Anna." She also appeared on "The Bold Type" as Tia Clayton.

Francis, most recently seen as Alicia on "The Sex Lives of College Girls," makes up the quintet of new surgical residents at the start of the season. She plays Mika Yasuda, who is described as "a middle child with eight siblings [who] is used to "being overlooked and underestimated — and uses it to her advantage. She's dealing with overwhelming student loans from med school, but she's scrappy and confident that she can make it in the program and rise to the top."

You might also recognise Francis from playing idealistic teenager Lily in Netflix's holiday comedy series "Dash & Lily."