There are very few movies so entertaining that they can survive being remade into a sequel. The only times the second, or even third film is as good as the first is when the movies were originally all shot as one, such as the Godfathers trilogy, Superman I-II, Star Wars and The Empire Strikes Back. Occasionally, a really strong performance or character can keep the interest going: all the James Bond movies are, of course, exactly the same except for the special effects and locations, and are none the worse for that. Pat Morita who plays the master Miyagi in the Karate Kid movies has always been the best thing about the stories, and it is thanks to him that tonight's film The Next Karate Kid (Pearl, 8.30pm) is watchable at all. This time Miyagi is reluctantly forced to take on another pupil, the grandchild of an old comrade whom he owes a favour. As well as being stroppy and difficult, this kid is also female, the only twist left in the genre. Some environmentalists predict that the search for water will become the most important issue of the next century, with global warming, pollution, and the human population explosion depleting natural resources to the point where nations go to war over access to lakes, rivers, and underground sources. This is not so far-fetched, as tonight's excellent documentary, Cadillac Desert: Mulholland's Dream (World, 8.30pm) shows. Eighty years ago a group of angry farmers almost declared war on the city of Los Angeles when their land dried up after a fellow called William Mulholland diverted all the rivers towards the metropolis. Mulholland, determined and imaginative, sneakily bought up the water rights to a valley 320 kilometres from the city when it became clear LA was fast outgrowing its natural supplies. The ensuing scandal, which ruined many lives, was retold in the film Chinatown, with John Huston playing the Mulholland character. When Nick Nolte teamed up with Eddie Murphy in 48 Hours, he pretty much let Murphy steal the show. Cast with a performer as irrepressible as Murphy, there wasn't really much else he could do. In tonight's film, The Three Fugitives (World, 9.30pm), he again plays the straight man in a chase movie, this time with Martin Short as the frenetic one and a little girl called Sarah Rowland Doroff playing a cute kid. The movie is a remake of a French film called Les Fugitifs, and this time the American studio allowed the original director, Francis Veber to do the remake too. Short plays an inept bank robber with an odd little daughter. One day he holds up a bank where Nolte, himself a reformed bank robber just out of jail, is trying to make a deposit. Short is so hopeless that Nolte is forced to help him just to prevent any accidents. But no one, least of all the cops led by James Earl Jones, is going to believe that.