Papelucho and the Martian

Papelucho and the Martian Spanish Papelucho y el Marciano is a featurelength Chilean animated film, created by Cine Animadores and CanalFilms, released onMay 2007.

Excited about trying to known everything about the Martians, Papelucho decides to catch one by using his experiments. One day, Papelucho surprising finds an actual Martian called Det, a Martian children, who is extremely curious about the humans and without thinking, he decide to introduce himself on Papeluchos body.Papelucho starts to live with Det inside his veins and establish a deep friendship with him, but he finally think that Det cannot live in Earth anymore and needs to return to Mars. For that purpose, Papelucho starts to build a spaceship for fly to Mars and bring his friend back to home without knowing what will happen to him. ........

Source: Wikipedia