This feature-length episode sees Springfield at the centre of an environmental crisis: the town has been dumping waste into the river to such an extent that the EPA - headed up by Russ Cargill (Albert Brooks) - have placed a dome over Springfield to prevent it contaminating the rest of the country. Of course, Homer gets blamed and the family are forced to flee to Alaska. Can the great bald one return triumphantly and save Springfield? A wave of panic washed over me in the first ten minutes: Environmentalism? Lisa falls in love? Was this going to be another boring, preachy episode from the spiky-haired whiner? Fortunately, those fears were allayed as Homer and Bart remain front-and-centre for the duration and the jokes come thick and fast. Well, for a while, anyway. With the voices of Dan Castellaneta, Julie Kavner, Nancy Cartwright and Yeardley Smith. For more serious viewing, stay with RTE1 for Walk The Line at 9.45pm.