An ambulance crash endangers the lives of the paramedics involved, as Meredith and the Chief work on-site to save them, Bailey treats a patient who refuses her help, and Ava returns for Alex and meets his other girlfriend in the process.

Alison La Placa, Cress Williams, Elizabeth Reaser, Gale Harold, John Billingsley, Kimberly Huie, Lauren Stamile, Seth Green, Theo Rossi