In the films Gremlins and Gremlins 2: The New Batch, the gremlins always start out as cute, fluffy but rarely friendly Mogwais which when eating after midnight turn into the terrible beasts that are the gremlins.
The Gremlins are the main villians of the movie, led by a Gremlin called Stripe. The originally started off as Mogwai's which spawned from a Eternal good Magwai called Gizmo after he got wet. These new Mogwai are evil and trick their owner Billy into giving them food and eat after midnight. The transform during the night and soon become Gremlins.
After the death of the most of the original Gremlins, their leader Stripe escapes and jumps into a pool which creates a massive horde of these creatures. Its up to Billy, his friend Kate and Gizmo to stop them
Gremlins 2: The New BatchEdit
The Gremlins return in the sequel movie, although many new types of Gremlins appear after being mutated by drinking chemical potions and other hormones. The new Gremlin horde are just as evil and mischievous than the ones in the previous ones, and led by the evil Brain Gremlin. This time its worse, they have been spanwed in the Clamp building in New York and trying to get out to spread chaos every where. Again its up to Billy, Gizmo and his friends to save the day.