Supernanny Jo Frost travels to Hawaii to help Will and Michelle Smith -- they are highly intelligent marine biologists, but when it comes to bringing up their two boys, they're clueless. Three-year-old Nate is still in diapers, and 18-month-old Ari screams at the top of his lungs to get his bottle. Bedtime is a nightmare, as Dad hypes the boys up with a frog-hunting outing right before they're supposed to be going to bed, leaving both parents exhausted and up for hours with the two energetic boys. Will and Michelle foster a house full of high energy and crazy fun, but all their singing and dancing (including the "pee-pee dance") can't tame the kids -- they freely admit the children are totally in charge. The parents have read the books, talked to experts and still can't figure out a way to control their toddlers. Without mastering even the basics of discipline, they worry that, if they can't cope with their children now, they'll never cope with their boisterous boys in the future.

• Jo Frost