Young narrator Tim (Matthew Knight) has mixed blood; he's part werewolf and part human. According to a hazy prophecy, when he turns 13 (three days after the film starts), something will happen. Either bad werewolves will be able to rampage at will, or the curse will be lifted from all. Trouble is, Tim and his human mom, Rachel (Rhona Mitra), are clueless. Only Uncle Jonas (
Elias Koteas) understands what's going on when the moon turns red and the bad werewolves ride into town on motorcycles. He, his mother Nana (Barbara Gordon), his daughter Kat (Sarah Carter), and assorted other "good" werewolves know that they need to shoot at scruffy-faced Varek (
Jason Behr) and his alarmingly cleavaged girlfriend Sonja (Natassia Malthe). Once the action commences, Tim learns to load weapons and help his family fight the bad werewolves, but Rachel is disinclined to fight.