The episode follows the wedding day of
ST3 doctor
Zosia March (
Camilla Arfwedson) and
registrar Oliver Valentine (
James Anderson). Zosia's father
Guy Self (
John Michie) attends a meeting with CEO
Henrik Hanssen (
Guy Henry) and medical director
Nina Karnik (
Ayesha Dharker). They inform him that Guy is suspended for being under the influence of alcohol in the operating theatre. Nina asks
consultant cardiothoracic surgeon Jac Naylor (
Rosie Marcel) to review all medical cases involving Guy to find possible errors. Nina then orders Jac to send a patient home waiting for a pioneering cosmetic procedure. She argues that the hospital is short staffed, needs beds and no negative attention. Nina talks to the patient and changes her mind, opting to assist Jac on the operation. Guy attends the wedding venue where he tries to make amends with Zosia. She initially forgives him, but orders him to leave when she realises he is manipulating her. Zosia's best friend, registrar
Dominic Copeland (
David Ames), walks her down the aisle and she marries Oliver. Guy drinks a bottle of whisky and destroys the wedding cake. He proceeds to make speech criticising his daughter and ruining their reception. Nurse
Ben "Lofty" Chiltern (
Lee Mead) puts Guy in a guest room to sleep, but Guy smashes glasses and bottles in the room. Dom's boyfriend Freddie Chapel (Aaron Fontaine) complains that the wedding is boring and abruptly leaves. An upset Dom is mean to Lofty who offers his support. He later goes to Lofty's room to apologise and kisses him. The pair sleep together unaware of trouble unfolding outside. Zosia finds Guy unconscious in the guest room. He has taken an overdose and fallen on a shard of glass. He is rushed to hospital where Jac and Nina battle to save his life. They manage to resuscitate him and remove the shard of glass. He has to have his spleen removed and is stabilised. Oliver tries to comfort Zosia who seems disinterested in him, as she sits by her father's bedside. ==Production==