There were a number of "rules" regarding Fangface. First, any image of the moon would transform Fangs into Fangface and any image of the sun would change Fangface back to Fangs. When Fangface would emerge, his first instinct was normally to beat up Pugsey. He normally had to be reminded that Pugsey was his pal. If Fangface sees or hears the mention of food or any food item, he tries to eat Pugsey. If he actually succeeds in stuffing Pugsey in his mouth, Biff or Kim would have to rub his foot in order to get him to relax and cough up Pugsey. Finally, if Fangface sees his reflection in a mirror, he goes crazy with howling and barking. See more
[Opening title narration
Fangface! Every 400 years, a baby werewolf is born into the Fangsworth family. And so when the moon shined on little Sherman Fangsworth, he changed into Fangface, a werewolf. Only the sun can change him back to normal. And so little Fangs grew up and teamed up with three daring teenagers: Kim, Biff, and Puggsy. And together they find danger, excitement, and adventure. Who can save the day? Who can wrong the rights, and right the wrongs? None other than Fangface!