Roger and his dog, Holly, lived in a house with a big backyard full of old oak trees. One oak tree was very big, twisted and scary looking. It cast a spooky shadow over the ground. One day Roger and Holly were playing in the backyard, then suddenly the scary tree's roots awoke and dragged them into a strange bright portal within its trunk. Roger and Holly fell down a long dark tunnel, terrified of what lay below. At the bottom, Roger discovers the magic of the tree. Holly could now talk. Their journey begins through dark cold caves and endless slimy tunnels with weird creatures waiting for Roger and Holly to enter their territory. Along their way back home, they encounter many misadventures. These misadventures were mainly the result of Roger's ability to attract trouble and not take Holly's advice. Can Roger and Holly find their way home?