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Natascha: The Girl In The Cellar 8pm, Five Austrian Natascha Kampusch was abducted at age 10 and held throughout her teen years by kidnapper Wolfgang Priklopil, finally escaping in 2006. In this documentary/reconstruction she recounts her experience, the like of which it's hard to imagine emerging from with any shred of sanity. Kampusch, however, now a TV host, is admirably, movingly articulate, describing, for example, her inability to scream at the moment of capture and her ambivalence towards Priklopil. EastEnders: The Greatest Cliffhangers 8pm, BBC3 It's Enders' 25th birthday this year, but they don't like to go on about it. So, apart from Friday's live episode where Archie's killer is finally prised from the cold, dead hands of the show's writers, 25 years of love, death, marriages, birth, deaths, divorces and deaths are celebrated in this three-parter. Expect all the favourites – Den and Angie's piggin' divorce, Little Mo-botherer Trevor's fiery demise and the Who Shot Phil? plot. Horizon: What Makes A Genius? 9pm, BBC2 Mathematician Marcus Du Sautoy, curious about his innate ability for mathematics and whether genius is the preserve of an elite few or something latent in all of us, goes in search of an answer to the title's question. At Louisville University he meets a researcher who has dissected the brains of great scientists in search of an understanding of advanced thinking, at MIT he encounters a rather scary mouse bred to be incapable of learning, and in London he meets a blind woman who has trained herself to "see" with her ears. An interesting investigation. Shrink Rap: Heather Mills 10pm, More4 Mills is not an immediately sympathetic person, but is a great candidate for a celebrity couch trip in the company of psychologist Dr Pamela Stephenson . This, after all, is someone with a rich inner life: with both an enormous sense of entitlement, and a huge chip on her shoulder. The Mills party line is "what doesn't kill you makes you stronger", and here Stephenson's inquiries on the loss of her leg, her family and the like are met with a robotic glare reminiscent of Steve Bell's rendering of Margaret Thatcher. Stephenson's meticulous approach, however, ultimately yields dividends.