Van Outen described Karin as manipulative, cheeky and mischievous and revealed that her character would "cause chaos for two men", adding that "it won't just be the men who Karin is winding up – the women of Walford won't like her either." Karin arrived in Albert Square for two episodes on 9 and 10 April, looking for Phil Mitchell (Steve McFadden). She then returned for a further two episodes from 27 April. Max Branning (Jake Wood) is impressed by Karin when she approaches him asking for the whereabouts of Phil, and Jay Brown (Jamie Borthwick) warns him that Karin's deceased husband was involved in a dodgy business. Max dismisses Jay and goes on to form a deal with Karin at the car lot, and the two later end up having sex, though it is implied that Phil had meant this to happen. The following morning, Karin visits Phil and he pays her a large sum of money; she leaves. Jay later reveals to Max that the cars Karin has supplied him with are stolen, so Max orders Karin to return and collect them. However, he changes his mind after a conversation between him and his sister, Carol Jackson (Lindsey Coulson). Karin returns to tell Max that the police have begun seizing the cars and that some have drugs in them. She tells Max to dump the cars and then takes his clothes to stop the police tracing his involvement. Phil agrees to help Max on the condition he sign over all of his businesses to Phil. After Max does so, Phil and Karin tell Max they made the whole story up to con him out of his businesses. Karin collects her final payment. She assures Max it was not personal, tells him "Karin Smart" is not her real name and leaves. Sister Ruth, played by June Whitfield, appears in three episodes on 1 May 2015, and 5 and 6 January 2016. Ruth is a nun at a care home for nuns that had previously been the nunnery where Kat Moon (Jessie Wallace) gave birth to her daughter Zoe Slater (Michelle Ryan) 31 years previously. Kat wants closure as Zoe was the product of rape by her uncle Harry Slater (Michael Elphick). Ruth was present at the birth and remembers it in detail. She and Kat discuss things and Ruth helps Kat to move on with her life. After Kat leaves, Ruth and Sister Judith (Sandy McDade) look at the birth record, seeing that Kat gave birth to twins, Zoe and a boy. When Kat returns from Spain after winning the lottery, she agrees to make a charitable donation to the convent.