Big Wolf on Campus (1999) : 3x5

Merton finds a way to enter Tommy's head, and see all what Tommy sees, hear what all Tommy's thoughts were, and the ability to control Tommy's body - The Janitor's Closet. With this new discovery, Merton helps Tommy get Lori to get back together, and when Merton realized that he would use Tommy's werewolf powers to get revenge on a new student in school that has been threatening and bullying Merton, whose name was Bucky. After this defeat, Bucky noticed the secret entrance too and uses Tommy's werewolf body to get back at Merton, and now Merton, Lori, Tommy, and Bucky are in a battle in Tommy's head for control.