The casts of Casualty and Holby City unite. The emergency and surgical staff are thrown together when a fuel tanker crashes into the hospital.

Comfort comes face-to-face with Fin's killer, who asks for her forgiveness as he stands on the brink of suicide, while Ellen announces she is marrying Abs.

Tess and Mike take Sam to see the psychiatrist, Pete turns to Claire for support and an immigration officer questions Abs about Ellen's whereabouts.

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Bex decides there's no way she can proceed with the court case. Tess resolves to bring Sam home from the psychiatric unit and Abs is pressured by loan sharks.

Luke remains tight-lipped over Bex's whereabouts and visits Claire for the first time since abandoning her at the funeral, while Maggie reaches the end of her tether.

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Selena is taken hostage by a drug trafficker during her police surgeon shift with Will. Guppy fears he may have contracted hepatitis, and Luke urges Claire to talk to Bex.

Two children go missing and suspicion falls on a local convicted paedophile, while Abs is still reeling from Simon's death.

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Comfort discovers she's pregnant and plans a romantic dinner for Fin, but his ambulance is involved in an accident while attending a bogus call.

A worried Comfort calls the police when she realises Fin has not been home and no one at work has heard from him. Luke turns up at Kate's house to check if she's all right.

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Concern mounts over Fin's disappearance and a new lead prompts police to step up their search. Luke persuades Kate to seek refuge with him.

Comfort is asked to identify a body, and desperately hopes it will not be Fin, while Abs is startled when Ellen makes him a proposition.

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Fin's ex-wife and son turn up at the funeral, reopening fresh wounds for Comfort, who collapses during the burial and is taken to hospital with stomach pains.

Comfort discharges herself from hospital, determined to keep her pregnancy secret, but on returning to work her world is rocked by a shocking revelation.

A confrontation with Ruth brings further pain for Comfort, Selena is reprimanded for not doing a thorough examination and Abs tells Claire the real reason he's marrying Ellen.

Comfort arrives home from the Christmas party to find Ruth has changed the locks on the door, Selena harasses Bex relentlessly throughout the day and Abs reprimands Sam.

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Harry tries to raise morale on the ward following Jim's death, Ellen receives unwelcome news about her visa and Bex struggles to deal with Selena's bullying.