Biography Grumpy had been spawned by the Mogwai known as Gizmo and had begun to live with Billy Peltzer, along with the other Mogwai created by Gizmo. Grumpy had been the right hand man to the leader of the evil Mogwai, Stripe, and had often assisted in carrying out his evil schemes. Like the other Mogwai (aside from Gizmo), had eaten the chicken Billy Peltzer gave them in order to become Gremlins. After eating it he hiccuped. The next day, he along with the others, entered his pupa stage inside their cocoons. Later that night they hatched and attacked Gizmo by tying him to a dart board and throwing darts at him. After Stripe disposed of Gizmo in the laundry chute, they explored the house. He and two of the others entered the kitchen and started to eat the gingerbread men Lynn Peltzer made