Surviving Alaska, 7.30pm, Discovery If you were hoping for a travelogue of one of the most beautiful places on earth, forget it. Instead this is about one crazy man putting himself into extreme situations: starting avalanches to see if they will bury him, jumping fully clothed into freezing water, climbing up crumbling ice shelves, and so on. And beautiful old Alaska? Well, it’s there. But you have to look beyond the many wanky adventure stunts to see it. Dexter, 10.40pm, Ten Our favourite blood- splatter analyst is called to a massacre the likes of which even he has never seen. Like a gothic Proust, Dexter ( Michael C. Hall) is flooded with intense childhood memories as about 60 litres of the red stuff flow, and I’m not talking pinot noir. There are no bodies but so much blood that he passes out and lands in a puddle of it, face first. Don’t say you weren’t warned.