Jack is a three-year-old chimpanzee who has been the subject of a long-term experiment by Dr. Kendall, a researcher who been teaching Jack to communicate through sign language. Jack, however, has not been making progress fast enough for Dr. Kendall's sponsor, Dr. Peabody, who has cut off his funding and sold Jack to a medical research lab. Afraid of what could happen to his simian friend, Dr. Kendall sneaks Jack out of his home in the lab; however, Jack is accidentally sent to Canada, where he gets loose and is discovered by Tara, a deaf girl who recognizes Jack's sign language. Jack has an even bigger surprise for Tara's older brother Steven; Jack scrambles onto the ice in the midst of practice for Steven's junior league hockey team, and he and his teammates discover the monkey has a natural talent for the game. With Jack on the team, Steven's team is on their way to a league championship...

In New York, the competent creative director of Birk Advertising Eddie Shneider is living a successful moment of his professional life and is engaged and has just proposed Judy Birk, the daughter of the owner of the company where he works. Eddie is also a wolf and very successful with many women, and is having an affair with a neighbor of the street where he lives with Judy. When he gets the account of the greatest American airline for his company, he is promoted to partner and he celebrates with his assistant and friend Angelina Sable in a lunch party in a restaurant. After hours, when they are in the garage, Angeline notes that she had forgotten her car keys in the office, and when she returns, she is violently raped by the despicable brother of Judy, Anthony Birk. On the next morning, when Eddie arrives in the garage, he finds the traumatized Angeline on the floor and he takes her to a hospital...