The plot revolves around an ape playing sports. Jack is a three-year-old chimpanzee who is the subject of an experiment involving sign language that is performed by Dr. Kendall. However, Dr. Kendall loses funding for his research and Kendall's boss, Mr. Peabody, sells Jack to a medical research lab, much to Dr. Kendall's dismay. Unfortunately, Dr. Kendall dies (off screen) from a heart attack. Kendall had set up Jack to be taken away from the lab, but Jack was sent to Canada by mistake. In Canada, Jack finds shelter in a tree house but a young deaf girl named Tara enters the tree house and Jack surprises, her causing her to faint; when Tara wakes up she learns he can use sign language, she attempts to hide Jack from her parents and brother Steven but is unsuccessful . Steven soon discovers that Jack has an uncanny ability to play the sport of ice hockey and Jack joins Steven's junior league hockey team when it is discovered that there is no rule that chimpanzees can't play hockey. However, just before the championship, Dr. Peabody returns to reclaim Jack.