Wilde (Ty Glaser). After a family holiday, Sacha's daughter Rachel is taken ill, and he is devastated to learn she has leukemia. As her treatment begins, he shaves his head to show support to her. When he learns that Daniel is a bone marrow match and is potentially the only one that can save Rachel's life, he authorizes the procedure without Chrissie's permission, creating problems between them. After a rocky few months, Chrissie takes Daniel and visits her father in Australia. When she returns, he learns through Daniel's nursery that she is back and suspects Chrissie of having an affair with Michael. However, it conspires she has breast cancer, which devastates Sacha. He later moves back in with Chrissie to support Daniel, but their separation continues. Development Casting and characterisation To compensate for the departing characters, several new characters joined the show during the course of the twelfth series. After appearing briefly as Chrissie's one-night stand, Bob Barrett became a main cast member playing Locum General surgical registrar Sacha Levy at Holby City Hospital. Barrett was initially contracted for eight months as part of the main cast. In May 2012, Barrett stated "I love it here and that's always been the case – since day one, I've had a ball. I love the cast, the crew and the people who run the show - it's a great team. I love being part of a programme that people hold dearly – and I feel the responsibility of that, too. He told Daniel Kilkelly of Digital Spy that he wanted to remain a part of the cast as long as his character had "a journey". Depression Sacha has been the focus of a story which raises awareness of male depression and it was scripted over an entire year. In April 2017, episodes featured Sacha behaving out of character and Essie Harrison (Kaye Wragg) worries about his mental health. The story begins when Sacha does not style his hair for work and wears dirty clothing. His usual caring bedside manner changed and he becomes irritated with a patient. He also tries to steal wine from a bar which prompts Essie to believe he has developed depression. Sacha breaks down in tears and reveals that he has been stealing to make himself feel better. Sacha gets his depression treated and gradually regains control. In July 2018, his behavior starts to cause concern again. First