'Grey's Anatomy' Season 18: ER Fightmaster To Recur As Series' First Non-Binary Doctor

"Grey's Anatomy" is casting a non-binary character in a recurring role for the first time.

ABC announced that E.R. Fightmaster has become a recurring member of the cast of the long-running medical drama, Variety reported Wednesday.

Fightmaster — who identifies as non-binary and uses they/them pronouns — will continue to play Dr. Kai Bartley in upcoming episodes after first appearing as the character in the third episode of "Grey's Anatomy" Season 18.

In the episode, Meredith (Ellen Pompeo) was being wooed by a well-funded hospital in Minnesota that wanted her to join its quest to cure Parkinson's Disease. She convinced neurosurgeon Amelia (Caterina Scorsone) to join her there in order to help with the decision, and they ended up meeting Kai, who is part of the research team in Minnesota.

"They are dedicated to their craft and extremely talented at what they do," ABC's description for Fightmaster's character read. "Confident as hell and able to make even the most detailed and mundane science seem exciting and cool, Kai and Amelia bond over their shared love of medicine and the brain."

Fightmaster's casting marks the first time a non-binary actor has starred as a non-binary doctor on "Grey's Anatomy." But this wasn't the first time the series cast a member of the LGBTQ+ community.

Trans actor Alex Blue Davis previously played surgical resident Casey Parker in Seasons 14 to 16, while non-binary actor Sara Ramirez portrayed Dr. Callie Torres from Seasons 2 to 12, according to People.

Jake Borelli, who currently stars on the series as Dr. Levi Schmitt, came out as gay in 2018, on the same day an episode of "Grey's Anatomy" aired in which his character came out as well.

The ABC series isn’t on for the next two weeks, but Fightmaster's character will appear in the Nov. 11 episode when the show returns. They will also be featured in a few more episodes before the midseason finale in December.

Following their debut, "Grey's Anatomy" fans immediately noticed the chemistry between Kai and Amelia and took to Twitter to express support for the potential new romance, especially after Amelia rejected Link's (Chris Carmack) proposal.

"So...can they please make this ship happen? Dr. Shepherd and Dr.Kai? [Please] @GreysABC @shondaland @KristaVernoff @caterinatweets," one fan tweeted.

"I am pretty sure Amelia is going to leave Link and end up with them by the end of Season 18. Dr. Kai Bartley is so cool!" another added.

Prior to joining "Grey's Anatomy," Fightmaster appeared on Hulu's "Shrill." They appeared as the love interest of Fran (Lolly Adefope) in Seasons 2 and 3.

"Grey's Anatomy" Season 18 will return on Nov. 11 at 9 p.m. EDT on ABC.