Billy Peltzer is a fictional character from the 1984 film Gremlins, directed by Joe Dante. He is a young man who works as a bank teller and lives in the fictional town of Kingston Falls. Billy is known for his kind-hearted nature and his close relationship with his pet Mogwai, named Gizmo. In the story, Billy receives Gizmo as a Christmas gift, but he must follow three important rules to care for him properly. When these rules are broken, it leads to chaos as the cute Mogwai transforms into mischievous and destructive creatures called Gremlins. Billy's journey involves trying to save his town from the havoc caused by these creatures.