Nancy ties the knot, but the team must first piece together the puzzle of a possible kidnapping.

Dispatcher Melanie McCavish and the team ramp up into all hands on deck when a barrage of shots-fired calls come in at the same time.

Dispatcher Abby Encarnacion is pregnant with her first child and must navigate working 12-hour shifts, taking highly emotional calls, and instructing CPR to a mother who discovers her son is unresponsive.

In her first week as supervisor, dispatcher Marra Wargo leads the team through a storm of emergencies, panicked witnesses, and a dog in danger.

911 Dispatcher Jackie Chappuies takes training rookie Hayley Kilbane into her own hands; together they face back-to-back carjackings at the same gas station and a possible overdose that calls for immediate CPR.

Supervisor Christine Mooch Muccino drives the shift through a series of crises including a fatal car accident and a horrific shooting in broad daylight, but nothing shakes her to the core more than when she learns of a crisis at home.