Olivia and Sally become medical detectives as they examine a woman having potential stroke. Paramedic Bill races to a man having seizures. The patient is going downhill fast and could lash out at the very people trying to save him.

Nhi and Carlos are under pressure to bring an overdose patient back from the brink of death. Laura and Aaron come across a shockingly injured motorbike rider. Ben and Tarnya apply their superhero skills to a toddler struggling to breathe.