Teen Wolf was a 1985 fantasy/comedy film directed by Rod Daniel and starring Michael J. Fox as the eponymous "teen wolf." Scott Howard is a normal high school student who discovers that he turns into a werewolf.
Scott Howard is an average basketball player who pines for his dream girl while his best friend pines for him. When he finds out that a werewolf gene runs in his family, he's shocked...until he finds that he can use his "wolf-ness" to his advantage. Scott becomes increasingly popular until his recognition takes a turn for the worse and he decides not to morph anymore. Although his basketball team could use a boot, Scott wins the game without supernatural means and gets together with his best friend, Boof.
A sequel, Teen Wolf Too, was made in 1988. Scott's cousin Todd also inheirts the family's ability to be a werewolf.