Gosei Knight is a mysterious and powerful ally who appears in the series Tensou Sentai Goseiger. Unlike the main Goseiger team, Gosei Knight is an independent entity who serves as the Earth's protector, acting on his own convictions. He is a Groundion Headder transformed into a humanoid form, embodying the Earth's will. Gosei Knight often works alongside the Goseigers, lending his strength against threats, but maintains a strict and serious demeanor, sometimes clashing with the team's ideals.