Series 18

Cara is feeling vulnerable after the break-up of her marriage as a car crash brings Mo's friend Sorcha and her surrogate son back to Holby.

Cara finds herself in a difficult position when Nicole is readmitted to the ward and in labour as Guy tries to cope following the explosion.

Cara faces awkward questions following Nicole's disappearance and turns to Jed to help as Mo faces giving William back to Brett.

It is Arthur's first day back at work as he tries to prove that he can cope as Guy's struggle of confidence continues to affect his work.

Mo heads into work, positively upbeat considering that she will no longer be surrogate mum to William as she is due to give him back to his father. When Brett faces a sudden medical setback and his mother-in-law Viv becomes obstructive, Mo feels she cannot possibly part with her beloved William and decides to abscond with him...

Nicole's return to AAU makes life more difficult for Cara as Dom's delight at being given a difficult case turns bad when dealing with a difficult patient.

Jac returns to work on Darwin leading to a battle with Guy over his plans as Morven and Arthur end up clashing over a patient.

Zosia fears that her days on Darwin may be numbered as she tries to impress Jac as Arthur tries to rekindle his friendship with Morven.

Fran steps up her manoeuvres against Jac and after she raises the possibility of a formal complaint from a patient's sister, Hanssen has to take it seriously.

It looks like Serena is going to spend another New Year's Eve alone but after some revellers at a gig are attacked, fate brings more than just a few casualties onto the hospital.

Arthur ends up being pushed to the limit after he attempts to win Morven's affections. Zosia has the chance of a prestigious research internship in Edinburgh and has to tell Ollie.

Guy's career continues to go from strength to strength but there is a cost. Essie lets her personal life affect her professional one as she attempts to deal with a difficult mother and son relationship.

Hanssen gets ready to fly back to Sweden to see his family and becomes suspicious that Guy is attempting to wrest control of the hospital something which Guy later publicly announces. Serena looks for reassurance that Hanssen will stay and fight the battle.

Back on Keller, Arthur finds himself in a compromising situation by Morven's father as Mo awaits the news if she is pregnant or not.

After an army medic shows up on Darwin Ward, tensions increase for Guy and Ollie. Serena has to make a difficult decision following the discovery of a family secret.

Somebody from from Dominic's past makes an unwelcome return and there are some traumatic consequences.

Cleared by the police, Dom returns to work but Lee still has the power he needs to hurt him as Austin's condition continues to deteriorate.

Bernie starts her first day on the ward trying to put her army life behind her as Arthur's dream of becoming a life donor gets a set back as Serena has to make a decision regarding Jason.

Arthur's attempt to save the life of a patient after being hit by a train leaves him burying his head in the sand as Adele ends up getting more than she bargained.

Operating on an old school teacher, Ric battles to remain in control as Mo learns that she hasn't won the role of consultant as Serena is worried about introducing Robbie to her family.

Bernie ends up having to question what she wants after her future at the hospital is put in doubt. Ollie and Zosia's world is blown apart after a former flame of his shows up.

Morven is left reeling by a life changing birthday gift as Mo clashes with Sir Dennis over a patient as Ric suffers an emotional outburst.

When Cara makes a move on Raf, complications arise as Arthur receives some shattering news as an old friend of Adele's is admitted to Darwin.

Jason shows up on AAU with his seriously ill carer Allan and Serena’s personal involvement manages to affect her professional judgement as Dom tries to support Arthur following the news that his cancer has spread as Cara has her first day on Darwin.

Following the death of his mother, Jesse attempts to reappraise his relationship with his father as Ina is readmitted to Darwin.

Bernie has to work alongside an old army colleague and ends up being forced to confront the secrets of the past and face the truth behind her sudden exit from the army as Mr T learns that no one takes him seriously as Serena has a choice to make between her happiness and Jason.

Bernie finds herself being served with divorce papers as Austin is admitted in urgent need of a transplant as Zosia persuades a dying patient to act as a guinea pig.

The arrival of her ex sees Bernie trying to keep her secret hidden as the hospital's new psychiatrist Naomi Palmer makes an instant impression on Fletch.

Mo finds herself having to listen to her heart instead of her head as Serena's actions leave devastating consequences as Arthur and Morven have a day they won't forget.

Zosia manages to overstep the mark and accuses a patient of a media leak forcing Oliver to deal with an unwelcome dilemma. Zosia comes to a gut-wrenching decision as Serena discovers Bernie is working on AAU, Dominic has to face his fears.

Arthur is determined to proof himself with Hanssen's ambitions as Raf manages to see Naomi in a different light as Oliver tries to get back together with Zosia.

Zosia finds herself having to chose between Arthur and her career as Dom finds his loyalty being tested by a familiar face as Bernie finds it hard to find her place on AAU.

Zosia begins to question where her loyalties lie as Arthur and Morven have a decision to make as Dom battles his guilt.

A major train accident sees Dom with the perfect opportunity to escape back into work mode. Bernie’s husband attempts to to play dirty in the divorce, as he turns her children against her.

As Jac launches the fully-formed Digby Stent, it looks like that someone has stolen their patent. Dom’s first day back doesn’t go as planned after a forthright new registrar shakes up the ward.

Dominic comes up with a unique way to grieve the loss of his best friend. Raf and Fletch clash after Raf reveals how he really feels about Naomi.

Jac reaches breaking point when Ollie diverts from her plans.

Mo struggles with a big choice about her future. Mikey causes more trouble for Fletch.

Essie finds her own life in danger when she tries to help a desperate patient.

Ollie questions his worth on the Darwin team.

Ric questions his surgical skill when he faces losing another young man.

Bernie faces an ethical dilemma when her wayward son arrives at the hospital.

Guy must face his past when an unexpected patient arrives at Holby.

Jac returns from her break but gets a shock when she sees who is working on Darwin.

With Evie still recovering from her fall, Fletch commits to being a better dad.

Sacha's birthday celebrations don't go quite according to plan.

Fletch is recovering from being attacked. Progress stalls when he loses feeling in his feet. As the paralysis spreads, Raf struggles to diagnose the cause. Will he make a breakthrough before it is too late? The passionate courtship of a patient and her beau reminds Zosia what she has lost with Ollie. In the dark about Ollie's relationship with Jasmine, Zosia begins to think about the possibility of reconciliation. A happily engaged patient and her partner present a vision of what might have been for Sacha and Essie. Have they made the right decision in breaking up?

Dominic is perturbed when Isaac's former surgical mentor is admitted. Despite the existence of a wife, it's clear there's a personal connection between the two men. Is Dom prepared to accept Isaac's past? Jasmine is keen to impress Jac professionally and make a connection with her half-sister personally. But will Jac's public acknowledgement of their relationship bring them together or drive them further apart? Ric is dispatched by Hanssen to deal with the estranged wife of the local MP - the feisty, French Francoise. Will Ric allow himself to succumb to her Gallic charms?

Mr T comes to Mo's rescue when she fears for her baby's life. Bernie makes a big decision about her future with Serena when an exciting opportunity arises. A big step in his relationship with Isaac puts Dom's friendship with Zosia at risk.

An accident in rehab sets back Fletch's recovery, but it's his attitude that proves the biggest obstacle. Can he beat the doom and gloom before pushing away those who are trying to help him? Isaac wants to impress Ric and Dom wants to impress Isaac, but when Dom sidelines his own success to help make Isaac look good they both wind up in trouble. Mo tries to befriend Inga in light of her new role as best man. Her attempts prove futile when she puts her foot in her mouth repeatedly and winds up covered in wee, having made an enemy out of Inga instead.