Guest Stars Stephanie Venditto as Dr. Lisa Harris Lisa Edelstein as Dr. Lianna Sardo Seamus Dever as Ronald Phelps Alexandra Krosney as Young Lianna Sardo Matthew Rauch as Dr. Klein Alicia Lagano as Michelle Holmes Katherine Kamhi as Paula Marcia Rodd as Sandra Pappish Eric Lutes as Dr. Evan Mayhew Jason Hall as Jesse Thom Gossom, Jr. as Pharmacist Francis Guinan as Dr. Charlton Gregory Michele Harrell as TBA Co Starring Laurie Boloven as Wendy Maggie Kilbourne as ER Nurse Pamela Bel Anu as Young Sandra Pappish Jack Hannibal as Mr. Patterson Robert Gallo as Building Manager Rae Ritke as Mrs. Patterson