Set in a gleaming new Major Trauma Centre that only deals with only the most serious cases, Critical is an emotional roller-coaster ride as an emergency medical team battles through the vital first hour of care to save lives that hang in the balance. The team is led by Glen Boyle, a trauma surgeon with a background in combat medicine who is called by Doctor Fiona Lomas to the trauma unit. Glen and Fiona's challenge must weld a disparate bunch of personalities into a crack life-saving team, against the opposition of senior doctor, Clive Archerfield.