On May 21, 2018, it was announced that Kim Raver had once again been promoted to series regular this season after previously having a recurring role last season.[1] On July 31, 2018, it was announced that Chris Carmack would be starring in a recurring role for Season 15, being revealed that he would play the role of a new orthopedic surgeon at the hospital.[2] On August 13, 2018, it was announced that Jeff Perry would be returning as Thatcher Grey, Meredith's father, for the first time since his last appearance in the seventh season.[3] On September 6, 2018, it was announced that Alex Landi had been cast in a recurring role as Dr. Nico Kim, who will be the first gay male surgeon to appear on the show.[4] On October 10, 2018, it was announced that Josh Radnor had been cast as Meredith's new love interest.[5] On December 13, 2018, it was announced that Jennifer Grey had been cast in "a mysterious role," later to be revealed she portrayed Brittany's mom.[6]