`Look, Dad, it's a bear.' `No dear, it's a frog. Bears wear hats.' The muppets are hardly ever as bad as they might be and here they go on a spoof jewel caper with a full quota of asides to the audience and spoofs of movie legend. Miss Piggy takes part in a (rather good) take-off of an Esther Williams water ballet and a Busy Berkeley dance routine, Kermit and Fozzie pose as twins to foil the villains, and Charles Grodin is splendidly po-faced as the rascally brother of heroine Diana Rigg, falling in love with Miss Piggy with heart-rending sincerity. There are longueurs, of course, but also continuous reminders of an original humour at work. `You know,' confides Fozzie to Kermit at a sleazy hotel, `I may be mistaken, but the bellhops look like rats.' `Humph,' says the proprietor, overhearing, `you should see the chambermaids.'


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