Tuck, Munch and Alex are the best friends in the world. But the construction of a highway passing through their neighborhood forces their family to move and threatens their friendship. A few days before they leave, the group discovers a series of strange encrypted messages on their smartphone. Convinced that this is hiding something, they decide to embark on a final adventure together and go on a discovery beyond the imagination: stranded on Earth, a mysterious little alien hides and is actively sought by the Government.