A rider is bucked off her horse and is lying helpless in remote bushland. A risky chopper rescue is her only chance, and Bill desperately tries to save a teacher having a massive heart attack.

Paramedics Laura and Aaron prepare for double the complications when a pregnant mum goes into labour. In a first for the show, cameras follow the patient into hospital not to save a life, but to welcome a new one.

Ben and Mim find a grandfather in agony with horrific burns after spilling a huge pot of boiling water over himself. Lisa's first day back from maternity leave has her examining a tiny baby with a soaring heart rate and high temperature.

Aaron and Laura fear the worst as they rush to a teen victim of a shark bite. Ben and Mim must tackle a footy player who's dislocated his shoulder and super mums, Sally and Olivia race to a terrified one year old with a severed finger.

Every second counts as paramedics rush to help people in crisis. A leaking oxygen bottle blows up in a man's face. Nhi and Carlos fear he could stop breathing at any moment. Bill is on high alert, dealing with a violent knife fight.