Gostomyisl (2020)

A scout from Alpha Centauri arrives on Earth to find out why earthlings prefer to show aliens most often as evil, merciless creatures. Having penetrated the archive and quickly studied the history of the Earth, instead of the code naming used on his home planet, he assigns himself the Old Slavic name Gostomyisl. Due to environmental problems on Earth, the first of the earthlings whom he accidentally meets is a high school student.