As Charlie celebrates his 30th anniversary, the department is thrown into chaos and the gang face their biggest challenge yet.
Elle attempts to rally the troops and Alicia discovers an uncomfortable truth.
Jac comes down to the ED to perform an emergency operation and Iain finds his injuries are affecting his work.
Ethan and Alicia are thrown together in a rescue operation, while Louise is on a mission to improve the relatives' room.
Charlie's high school sweetheart stands in the way of Duffy, whilst David is forced to reveal some inner truths.
Ethan struggles to make Alicia's birthday a day to remember as Lily deals with a family feud too close to home.
Robyn's plans are thwarted when Glen takes a turn for the worst and Dylan's clinical skills are put to the test.
Elle questions Connie's focus, while Robyn's plans for the future take an unexpected turn.
Robyn faces a difficult decision, while Ethan passes up the chance of happiness for the sake of his brother.
Dervla goes missing and Dylan's distraught. Could the new F1 have something to do with it?
A traumatic birth brings Duffy and Charlie closer together, while Dylan gains insight into his new mentee Seb.
An undercover inspection pits the doctors against the nurses, and Connie struggles to come to terms with Grace's condition.
After a disappointing review, Jacob, Charlie and Duffy decide to challenge the team. Will Louise find her heart? Can Noel compete with the brainless machines? Does David have the courage he needs?
Ethan struggles with his feelings as things heat up between Cal and Alicia, while Duffy receives a surprise visitor.
Duffy's forced to choose between her own happiness and that of her family, while Dylan and Seb struggle to work together following an awkward Christmas party.
Rumours spread about Seb and Dylan, and Ethan's loyalty is pushed to the limit.
Dylan becomes the source of ED gossip after Seb's allegation, while Alicia and Ethan are forced to face the consequences of their actions.
Elle's career is on the line as Connie goes on the warpath, while David struggles to connect with his son.
Iain is confronted by his secret past, and Connie continues her crusade against Elle.
Cal's trust in Alicia is tested by a horrifying discovery, and Charlie and Duffy's wedding is in jeopardy after Charlie takes things a step too far.
Charlie is missing following his stag do, and Duffy is convinced he has cold feet.
Connie's crusade reaches its pinnacle at Elle's hearing, and Robyn questions whether she's fit to be a mother.
Iain tries to make amends for his past but gets more than he bargained for, while Dylan struggles to cope in an ED under pressure of binge drinkers.
Connie's faced with a difficult decision when an opportunity for vengeance arises, and Iain is determined to make amends with his sister.
David's erratic behaviour is a source of concern, and Gem struggles on her first day at work.
Charlie helps a reluctant friend to face her fears as David's behaviour spirals out of control.
Robyn tries to make David see sense as the team rush to find them, but an unexpected arrival makes her own situation all the more perilous.
Five days spent with Robyn on the neonatal intensive care unit, will her baby pull through the traumas of her premature birth?
There's bad news in store for the team as Sam announces budget cuts, and Gem hitches a ride with Iain.
Connie is faced with a difficult decision when Hugo's dad delivers some shocking news, and David faces a difficult first day back after his breakdown.
Jez's promiscuity lands him in hot water, as Cal rallies the team to take on Sam.
Sam goes back to the floor and makes an error, while Iain's disappointment in his sister leads to tragic consequences.
Events with the Ellissons spiral out of control, while Gemma faces the consequences of her actions.
Jez reveals his true feelings for Mickey, as a revelation about recent events leaves Ethan reeling.
It's time for Hugo to go home, but is Connie ready to let him go?
Elle's career talk at her son Blake's school doesn't go to plan when she discovers some unexpected truths about him and his friends. Luckily, Jacob and Josh are on hand to help.
When Ethan comes face-to-face with Scott Ellison, will he get the answers he wants?
Ethan looks for answers about Cal's last moments as he plans his last goodbye.
It's the day of the consultants' interviews, but who is going to lose their job? Meanwhile, Lily and Iain are loved up after a night of passion, but how long will it last?
A new registrar arrives for his first shift, sending shockwaves through the ED, as David enlists a reluctant Dylan to help turn his fortunes around.
Ethan's obsession with Scott Ellisson comes between his relationship with Alicia, while Connie and Sam's feud puts the team in an awkward position.
Jez and Mickey's relationship is put to the test, while the team rally to raise money for the Calais trip.
The Ellissons are back in the ED creating trouble, while Connie shows off a fixed Grace.
Ethan throws himself into work, Jez faces a harrowing incident and Duffy mentors a pair of school girls who are observing an hour in the department.