The heroes in a half shell are back. Raphael, Michelangelo, Leonardo and Donatello, better known as the Teenage Mutant Ninja Turtles, are getting a re-release. The highest grossing independent film ever (no, really), it looks a little shabby next to the hi-tech wizardry of today's cinema, but that's hardly likely to deter pre-teens from revelling in the turtles' nunchaku action. The plot hardly bears repeating: in the face of a gang of thieves taking over New York, the turtles turn vigilante, their operations controlled by Splinter, a giant rat schooled in martial arts. With just enough self-awareness of how silly it all is, TMNT is cartoonish enough to prevent the violence becoming too disturbing for little 'uns, and cheesy enough to appeal to fans of post-modern irony. It'll be huge. Cowabunga!