Must-watch TV

Ireland v Wales

sport

RTÉ Two, 1.30pm
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Tom McGurk presents the fourth weekend of RBS 6 Nations rugby action with George Hook, Brent Pope and Conor O'Shea in studio. Ireland take on Wales live from Croke Park at 2.30pm; then Scotland meet England at Murrayfield, kick-off at 5.00pm. Wales will be looking for revenge for last year's 17-15 defeat in Cardiff, which gave us a first Grand Slam in 61 years. Much will be expected too from Andy Robinson, the Englishman who took over as Scottish coach last year. Robinson was forced to quit as England coach in 2006 after a string of poor results, and will be out to prove himself to former bosses.

Let's Dance for Sport Relief

dance

BBC One, 7pm
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Claudia Winkleman and Steve Jones host the grand finale of the celebrity dance extravaganza, as viewers get the opportunity to have their say in who should be crowned twinkle-toed champion. For the past three weeks, we have had a variety of sharp moves from Katy Brand (Single Ladies, Beyoncé), Kate and Richard from GMTV (Greased Lightning, Grease), Debra Stephenson (Smooth Criminal, Michael Jackson) and the boxers doing Bad Guys from Bugsy Malone. Tonight, one of the six chosen finalists will be crowned king or queen of the dancefloor.

Heroes

drama

BBC Two, 10pm
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Tonight, Samuel learns the full potential of his power and provides Hiro with an ultimatum that reveals a tragedy for one of the heroes. Tracy, meanwhile, begins to lose control of her abilities when one of her own comes into harm's way. Elsewhere, the war between Sylar and Matt wages on and Nathan is shocked by a revelation which confuses and isolates him.

Piers Morgan's Life Stories

chat

UTV, 9pm
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Kym Marsh is tonight's guest, best-known from Coronation Street and from the Pop Star to Operastar series. The one-time bulimia victim was engaged at 18, with a baby on the way. In 2000, she was a single mother of two kids, living on social welfare. Then Popstars launched her into public view and Kym was the so-called loud, bitchy one in the band that came out of it, Hear'Say. The actress and singer has summed herself up: "loud, sensitive, honest, sometimes too honest, that's where this whole bitch thing comes from I think". Anyway, the Piers lad will peel away the layers.