S4, E9: An ambulance crash endangers the lives of the paramedics involved; Bailey treats a patient who refuses her help; Ava returns for Alex and meets his other girlfriend.
Seth Green
Elizabeth Reaser
Gale Harold
Cress Williams
Lauren Stamile
John Billingsley
Theo Rossi
Kimberly Huie
Alison La Placa
Ray Ford
Shanelle Workman