legend of the werewolf (1975)

aka Plague of the Werewolves.
"The moon controls the ocean, and drives some men insane..."
His parents killed by wolves, the surviving boy is then brought up by them. He is then discovered by a traveling show and exhibited as a feral wolfboy until one full moon he turns and kills a member of the troupe. Now a murderer he flees to Paris, but his background is never far from his mind, especially when the moon is full.
This is essentially a re-version of an earlier Hammer film, Curse of the Werewolf, making use of many of Hammer's regulars, including Peter Cushing, and despite the limited budget, they give a good account. Though the poor Parisian setting looks too bright and clean for my liking.