Guest Stars Debbie Allen as Dr. Catherine Avery Greg Germann as Dr. Tom Koracick Stefania Spampinato as Dr. Carina DeLuca Abigail Spencer as Dr. Megan Hunt Bill Smitrovich as Dr. Walter Carr Chelcie Ross as Dr. Harper Avery Co Starring Aniela Gumbs as Zola Grey Shepherd Vivian Nixon as Hannah Brody Grace Rowe as Paramedic Grace Skyler James as Pete Hover Amie Farrell as Marnie Clayton Farris as Kevin Carly Peeters as Jamie Hall