This crazy family comedy begins as two bumbling jewel thieves lose the mysterious Mazinski Diamond. It's pocketed by a baby circus kangaroo, who escapes to a nearby barn. Lonely teen Ella finds the critter and names her Joey. But the magical gem causes Joey to grow quickly and gain the power of speech! Soon the thieves, the cops, and Joey's owners are all hunting for the mischievous ‘roo and the alien crystal. Can Ella and new boyfriend Luke get Joey to safety in time? They better get hoppin'!