Dragon Ball: Episode of Bardock (2011)
Plot
After Planet Vegeta's annihilation, Bardock awakens on a strange, prehistoric world, his memories fractured. He soon encounters Chilled, a tyrant who is Frieza's ancient forebear, and witnesses his brutal subjugation of the planet's inhabitants. Realizing Chilled's cruelty mirrors his own past, Bardock finds a new purpose in defiance. As the alien overlord pushes him to his limits, Bardock's rage ignites, transforming him into the legendary Super Saiyan, a golden warrior who unleashes his power to protect the very people he once would have destroyed.