While digging for roots, the Butlers and the Cave Dwellers see a Tyrannosaurus Rex running from the only thing it is afraid of - fire ants! These hand-size ants are swarming toward the Butler's cave. Lok runs to the village to warn the tribe. The villagers try to get Lok to abandon his family while they run for the hills, but Lok runs back to his family instead. The village is surrounded by army ants. Gorak decides to hold the ants off by surrounding the cave with lit coal. The family digs for coal as fast as they can. Kim gets the idea of making a hot air balloon to take them to the top of the cliff where the ants won't come. They demonstrate the principle to the cave dwellers and they all start stitching hides together. Gorak goes to the cave of Giant Snakes to find enough snake skin to make a balloon. Lok and Katie go to the river to see if the fire ants have crossed the river. They watch the ants chew a tree down and cross the river on it. While John is figuring out how big the bal