Based on the famous Twilight Zone episode, Nightmare at 20,000 feet, this version tells the same story but from the gremlin's perspective. What was the gremlin doing on that aeroplane? Well, it seems it was simply trying to find a place to sleep for the night and ended up 20,000 feet in the air with a deranged passenger inside bent on its destruction.
Despite the nightmare scenario, the gremlin tries its best to sit out the trip and even fixes the engine when it sniffs out a loose cable which is causing a fire.
The passenger sees things otherwise and shoots the gremlin through the window, sending it spiralling to its doom in the ocean.