Berta is opening an exhibit on the Whatsacallit of Treetop Woods. If only she could get a picture to prove to everyone it's real. She and the Mechas set out to take its picture without being spotted, and find out its identity. / Gerry and Ranger Nat are leading the Treetop Troops on a hike, but soon discover Nat is lost! The Mechas need to find Nat before it gets too dark, until they realize that they can use flashlights to not only see, but communicate.