Libby has the perfect birthday surprise planned for Cara. Unlike previous year's surprises, Libby is determined this surprise will go smoothly. In fact, her two friends Maci, an aphid wasp, and Fern, a stinkbug, are coming along to help. All Libby has to do is find the right battery at the Big Tree's battery sale and return it to the shed before Cara's birthday party. Easy right? But Libby's trip doesn't go exactly as planned, leaving Libby with an unusual gift and her friend, Fern, convinced they broke the time barrier.