In an action-packed box set finale, Iain finds himself on his most frightening HART mission yet. Everything's been leading up to this – but will everyone make it out alive?

The ED staff have to remain professional as they treat a divisive figure, Iain runs away from his problems, Dylan expresses concern for Flynn, and Ngozi prepares to say goodbye.

Nicole makes the journey to Newcastle to find out more about her past. Meanwhile, Flynn faces a heartbreaking decision in the ED.

Rash is horrified when Sunny's actions result in a brutal attack, Flynn offers to help an emotional Nicole, and Iain struggles to resolve his issues with Faith.

Nicole faces a tragedy when her attempts to protect a loved one have devastating consequences, Rash steps up for Sunny, and Iain is determined to prove Jacob's innocence.

Jacob is furious that he's Iain's number one suspect for the missing morphine, Cam's career is threatened after an accusation is made, and Ngozi worries that she might lose Nicole forever.

Iain questions those closest to him, Nicole decides to make a difference, whilst Flynn and Dylan clash over how to tackle a drug crisis.

The ED is overwhelmed by an influx of teens, while Siobhan worries about the nurses out at a nightclub. Nicole is compromised, and Faith grows suspicious of the paramedics.

Iain and Teddy are exposed to danger from a high-risk patient, while Ngozi battles temptation on a tough shift and Jacob faces a dead end in trying to help his son.

Ngozi hits a new low, Flynn prepares for a drugs crisis, and Iain and Teddy are put to the test.

Patients who have overdosed flood the ED, and Stevie throws herself in at the deep end. Nicole is reunited with somebody from her past, and the fractures widen in the paramedic team.

Iain's career soars to new heights after a daring crane rescue, but will Faith approve? Flynn struggles with his daughters, and can a tense Ngozi and Nicole still work together?