 Scott McCall (Tyler Posey), is an average teenager suffering from asthma and living with his single mother in Beacon Hills.One night, he and his best friend Stiles Stilinski (Dylan O'Brien), the son of the local sheriff, Sheriff Stilinski (Linden Ashby), learn about half a corpse found by police in the woods.The two set out to find the other half, but Scott is attacked and bitten by a werewolf.