Bela is a gypsy who was cursed with lycanthropy. After seeing the sign of a pentagram on the palm of Jenny Williams, he becomes agitated and she leaves with Lawrence Talbot. The pentagram is a sign that the person will be the werewolf's next victim.
That night there was a full moon and Bela turned into a werewolf. He attacked Jenny and Talbot managed to kill him, but he was bitten in the process. Later Colonel Paul Montford investigated Talbot for murder when Bela's head wound matched Talbot's silver cane handle.