Teller Number Four Please...
After being bitten by a werewolf during the Blood Moon, Bank Teller Sterling Carter was disturbed to find himself turning into a feral monster each full moon initially. At these times he locked himself away to prevent causing injury to others. However as time went on he found himself turning feral more and more often until he was almost permanently in werewolf form. Thankfully while in one of his lucid periods Sterling was able to contact Professor Zack Zapperoni, a local scientist, for help. While unable to reverse the now almost permanent change to werewolf form, the professor was able to construct a mask to administer a drug which would at least allow Sterling to remain in control and not give in to his more feral tendencies. It also had a two fold purpose of preventing Sterling from biting another person and possibly passing on the infection.
With the Professor's help, Sterling Carter found a new purpose and decided to use his wolf given gifts to help people and so became the hero known as Wolf Bane.