Stripe first made an appearance in the film Gremlins and was born has a Mogwai after one of Billy Peltzer's friends accidentally dropped a glass of water from a vase on Gizmo the Mogwai. Stripe also appeared to be the first Mogwai that was born from Gizmo as it would seem that that particular Mogwai had a white stripe on his head. After the Mogwai where finished unfolding, Billy's friend tries to pet Stripe. However, Stripe reacts and tries to bite Billy's friend. Stripe soon after started to exhibit signs of hostility to Gizmo by vomiting on Gizmo while he was playing the video game Donkey Kong on some kind of mechanical toy, seemingly annoyed by the sound of Gizmo's Christmas horn. Stripe later hatched a plot to trick Billy into feeding him and the Mogwai after midnight by unplugging Billy's clock about fifteen minutes before midnight. Somehow, Stripe knew what would happen to the Mogwai if they where fed after midnight. Sure enough, Billy feeds the Mogwai, all except for Gizmo who refused to eat Billy's chicken and also must have known what would happen if he had eaten after midnight.
Gizmo later wakes up in the morning to find that the Mogwai had formed cocoons muttering "uh-oh". Stripe later hatches from his cocoon as a gremlin and is first seen in his gremlin form when he peaks out of a chest to watch another gremlin attack Billy's mom; Lynn Peltzer. After Billy returns home to find his mother being attacked by the gremlin, Billy chops off it's head. Seconds later, Stripe appears from hiding behind a curtain and blows his nose on the curtain right before forcefully breaking a window and escaping into the town of Kingston Falls. Billy and Gizmo later track him down to the Kingston Falls YMCA where he somehow sets off the YMCA's alarm and then lunges at Billy and scratches Billy on the chest. He then jumps into the YMCA's pool and starts to create more gremlins since the rest of the first batch had been killed by Billy and his mother.
Stripe later appears out of the shadows and utters the word "caca" to let his army know that it is safe. He then soon after comes out from hiding in some bushes and orders his some of his gremlins to dress up as Christmas carolers and attack Mrs.Deagle's home. Stripe then later appears with the rest of the gremlins at Dorry's Tavern where he shoots another of his fellow gremlins for cheating at a game of poker. He then leaves the tavern with the other gremlins to the Kingston Falls movie theater where he seems to think that he is wasting his time judging by the displeased expression on his face when he is seen in the theater. Another gremlin who appears to be his girlfriend tells him to go get Milk Duds from the snack bar. Stripe checks the snack bar only to find that there is no more food left and then spots a nearby convenience store and utters the term "yum-yum". He then appears with his arms full of candy and then sees the explosion from the movie theater that Billy and his girlfriend Katehad set off. When Billy spots him in the window of the convenience store, he drops all of his candy and escapes.
He is then seen riding a skateboard in an a temp to escape from Billy. Billy tries to track him down and sees him on several of the store's TV screens. He then tries to shoot Billy with some crossbow arrows in an a temp to kill Billy. However, when his plan fails, he starts to use a chainsaw to attack Billy. Stripe nearly wins until Kate activates the stores lights, causing Stripe to temporally lose his vision and loses control of his chainsaw which drags him to the store's garden section. When he spots the water fountain in the garden section, he utters "water" and then seconds after spots a handgun in a display case and says "gun".
When Billy walks into the garden section of the store, Stripe is seen standing on the water fountain with his handgun and prepares to shoot him. Stripe then puts his finger in the water (in the hopes of creating more gremlins) which causes bubbles of new gremlins to form on his back. Gizmo later appears in a toy car which crashes. Stripe then spots Gizmo and prepares to shoot Gizmo while saying "Gizmo caca!". However, Gizmo opens up a window shade and lets bright light into the room, causing Stripe to start decaying. Seconds after decaying, he falls into the lower section of the water fountain. When Billy gets closer to the fountain to be sure that he is dead, his skeleton lunges at Billy. However his skeleton then starts to turn into a bubbling liquid. Stripe's bubbling ooze is left in the store as Billy, his father; Rand Peltzer, and Kate depart.