Arc-Gurren Lagann (アークグレン, Aku-Guren-Ragan?), taken from the name Arc-Gurren given by Rossiu Adai, is the combination of one of Lordgenome's Gunmen battleships with Simon's Gurren-Lagann. It is formed when Simon combines the two mechs in order to save the former from destruction at the hands of the Anti-Spirals' attack force, the Mugann. It is later used as the Ultra Spiral Powerplant that powers Super Galaxy Gurren Lagann.