The Split is a British legal drama television series, written and created by Abi Morgan, that first broadcast in the United Kingdom on BBC One on 24 April 2018. The first series, commissioned in August 2016, follows the lives of the Defoe family, who all work in divorce law for the family firm, aside from eldest sister Hannah (Nicola Walker), who works for rival family law firm Noble & Hale and youngest daughter who is a nanny. The series co-stars Stephen Mangan, Fiona Button, Annabel Scholey and Barry Atsma. Series 2 saw the return of the Defoe family at newly merged law firm Noble Hale Defoe, with most of the original cast confirmed. The third and final series premiered on 4 April 2022. For her performance in the final series, Walker received a TV Choice Award nomination for Best Actress and a National Television Award nomination for Drama Performance while The Split was nominated for Returning Drama. Cast Main Nicola Walker as Hannah Stern, a divorce lawyer working for Noble & Hale Stephen Mangan as Nathan Stern, Hannah's husband, a barrister Fiona Button as Rose Defoe, Hannah's youngest sister Annabel Scholey as Nina Defoe, Hannah's younger sister, a fellow divorce lawyer for Defoe's, the family practice Barry Atsma as Christie Carmichael, Hannah's former boyfriend who also works for Noble & Hale Stephen Tompkinson as Davey McKenzie, a millionaire divorcing his wife (series 1) Meera Syal as Goldie McKenzie, Davey's wife and his company's secretary (series 1, 3) Anthony Head as Oscar Defoe, Hannah's long lost father (series 1) Deborah Findlay as Ruth Defoe, Hannah's mother, the director of the family firm Rudi Dharmalingam as James Cutler, Rose's fiancé, later husband Chukwudi Iwuji as Alexander 'Zander' Hale, director of Noble Hale Defoe Donna Air as Fi Hansen, a famous presenter divorcing her husband (series 2) Ben Bailey Smith as Richie Hansen, Fi's husband (series 2) Damien Molony as Tyler Donaghue, Zander's fiancé, later husband (series 2-3) Ian McElhinney as Prof Ronnie, a friend and later love interest of Ruth Defoe (series 2-3) Lara Pulver as Kate Pencastle, a child psychologist and Nathan's new partner (series 3) Supporting Kobna Holdbrook-Smith as Glen Peters, the vicar performing Rose and James' wedding ceremony (series 1, 3) Maggie O'Neill as Yvonne Duchy, Goldie's best friend, who is having an affair with her husband (series 1) Josette Simon as Maya, Oscar Defoe's second partner (series 1)