New Kids On The Planet (3) - S2.E23

Bobby, Skeeter, Nina and Nicole learn of a Tunican plot to take over earth by replacing every teenager on it with a Tunican clone. Skeeter's personality gets the kids out of jail and into a battle with the evil Tunicans. Eventually, everybody makes it safely back to earth, but nobody believes Skeeter when he brags about his interplanetary adventures.