Planet Vega was the original homeworld of King Vega and the Vegan Empire. It was in the same solar system as Planet Fleed, where the royal families would come into contact. However with the mining of the element Vegatron for weaponry, Planet Vega became exposed to its radiation and was slowly decaying. This became the driving force for the empire to expand their domain, rather than stop the mining of Vegatron. Near the end of Grendizer, Planet Vega suffered from a natural disaster from the mining and fell apart. King Vega had left his people behind on the dying planet to travel to his army's base on Earth's moon.