The film is set in an alternate timeline where Planet Vegeta was never destroyed by Frieza.
Legend: A Dragon Ball Tale- by Studio Stray Dog, fan animation : r/dbz Legend: A Dragon Ball Tale
: In this version, the Saiyans maintain their sovereignty, and Vegeta's father is the Emperor. Key Features The film is set in an alternate timeline
: Vegeta, now the King of all Saiyans , is sent on an interstellar mission by the Grand Council to assassinate the "Legendary Super Saiyan," Broly. the Saiyans maintain their sovereignty