Special Guest Stars Kate Walsh as Dr. Addison Forbes Montgomery Guest Stars Jaicy Elliot as Dr. Taryn Helm Debbie Allen as Dr. Catherine Avery Stefania Spampinato as Dr. Carina DeLuca Alex Landi as Dr. Nico Kim Abigail Spencer as Dr. Megan Hunt Nikhil Shukla as Dr. Reza Khan Robert I. Mesa as Dr. James Chee Johnny Rey Diaz as Noah Young Meryl Hathaway as Tovah Freedman Michael Bowen as Roy Davis Derek Mio as Dustin Michelle Meredith as Niki Co Starring Sylvia Kwan as Dr. Mabel Tseng Zaiver Sinnett as Dr. Zander Perez Bardia Seiri as Farouk Shami Thad Turner as Vet