With systems still down, Dana calls in an old friend with experience running a low-tech ER - but not before one of Javadi's patients slips through the cracks. Santos tends to the young victim of a fireworks explosion and Robby makes Whitaker an offer.

While King struggles to cope with her sister's newfound independence, McKay brings Ogilvie along to help treat a patient in the field. Later, both patients and staff are put on edge by an unexpected presence in the ER.