Guest Stars Debbie Allen as Dr. Catherine Avery Tina Majorino as Dr. Heather Brooks Justin Bruening as Matthew Taylor Mara Hall as Nurse Kathleen Veronica Cartwright as Lydia Ashford Heather Hemmens as Sasha James McAndrew as Nate Bobby Campo as Brian Caryn West as Maura Brooks Noel Arthur as Deputy Fire Chief Jennifer Lauren DiBella as Nurse Andrea