Gurren Lagann the Movie: Childhood's End
劇場版 天元突破グレンラガン 紅蓮篇 (original)
Simon and Kamina live in an underground city monitored by the village chief. When Simon stumbles upon an artifact and beastmen invade from the surface, Simon and Kamina rebel against them.
Starring Tetsuya Kakihara, Katsuyuki Konishi, Marina Inoue, Yukari Fukui, Nobuyuki Hiyama, Mitsuki Saiga, Masaya Onosaka, Michiko Neya, Kiyoshi Kawakubo, Akio Suyama
It's a action and comedy movie, and has a rating of 7.6 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from United States.