Twins Bradley and Brian Pinto are getting ready to celebrate Mother's Day by treating their mom to a show by Hypo, the world's greatest hypnotist. Brian hopes that if Hypo can hypnotize his mom into loving ducks, then she will let him raise ducks in their backyard. But when the Pinto family gets home from the show, the twins' mom starts acting strange. She splashes in the bathtub for hours, leaves corn kernels all over, and—could it be?—quacks! Bradley thinks his mom has actually turned into a duck! How did this happen? Can Bradley and Brian, with help from their friends Lucy and Nate, turn their mom back into herself?