A well-rounded, unpretentious, very funny, knockabout adventure - subtly blended so that it's fun for all the family.

The most interesting part of the film for a non-Teenage Mutant Ninja Turtle fan is the production design - the sewers and the city streets above them. Roy Forge Smith is the designer, and seems inspired by a low-rent vision of Batman or maybe Metropolis.

The script is peppered with clever lines even the transformation (and expansion) of cartoon violence into the live arena is achieved without resorting to realism. To balance the fighting, Splinter waxes philosophically on loyalty, perseverance and anger.

This film debut of the carapaced comic-book heroes features solid animatronic effects and a straightforward approach to superhero adventurism that should appeal to young Ninja Turtle fans, who should be pleased to see the terrapins brought so faithfully to the screen. However, a long-winded plot, broad characterizations and barely adequate fight scenes will prevent Teenage Mutant Ninja Turtles from generating any breakthrough business.

Jim Henson's Creature Shop has created splendid animatronic characters (including a four-foot talking rat), though extra distinguishing marks between the turtles would be appreciated. Between the dubbed dialogue and the dark visuals, the cumulative effect is curiously dislocating.