Run through a prehistoric jungle with Og the Curious Caveboy as he sets out on a quest to capture a whimsical rainbow. Be careful! It's easy to get lost and you never know what strange, menacing creatures you may encounter along the way. Og discovers the colorful arch of wonderment after a terrible storm and decides to capture it and bring it back to his cave in order to protect his family from 'Thunda the Terrible'.