There's only a slim chance that black and white parents will have twins of different skin colour and 50 years ago these twin births were almost unheard of in the UK; however, with the number of interracial relationships increasing, so too will the number of cases. Telling the surprising story of this genetic phenomenon, Twincredibles, part of BBC Two's Mixed Race Season, explores the life experiences of five sets of black and white twins, from babies and teenagers through to brothers nearing 30, who are similar in so many other ways but lead very different lives because of the colour of their skin. The programme hears from teenagers James and Daniel, who grew up in South East London, where it was the whiter-looking twin Daniel who suffered racial abuse; 11-year-old Glaswegian twins Ebony and Moesha who are very different in character; and new mum Shirley who has just given birth to twins Hope and Leo.