Chip needs to find one last insect to complete his bug hunt for Science Club so Biff and Wilf offer to help. But as the trio scour the park looking for a little insect, they stumble upon something much bigger. Chewed branches… a missing tooth… giant footprints… is there a yeti living in the park? The children follow the clues and make a discovery that’s bigger and smellier than they could ever have imagined.