Werewolf by Night

Jack Russell is a descendant of the mystically-altered offshoot of humans known as Lycanthropes. During the night of the full moon and the two nights surrounding it he is forced to mutate into a werewolf, a large, powerful form which is a hybrid of human and wolf, and loses his human intellect. Through a series of events, he is also capable of mutating voluntarily outside of the full moon, at which time he remains in control.