Fantastic Planet (1973)

On the distant planet of Ygam, the towering blue Draags reign supreme, viewing the tiny human-like Oms as mere animals, either kept as pets or ruthlessly hunted in the wild. Amid this oppression, a young Om named Terr is adopted by a Draag girl. Through a twist of fate, Terr gains access to the Draags' advanced knowledge. Terr escapes into the wilderness, carrying a powerful secret that could spark a revolutionary upheaval.