Aliens in underpants save the world. Aliens in underpants save the world Aliens in underpants save the world / Wai xing ren zheng jiu di qiu/: Aliens in underpants save the world, Wai xing ren zheng jiu di qiu =: Aliens in underpants save the world/ Going to the end of the world. Wai xing ren zheng jiu di qiu =: Aliens in underpants save the world / 书名原文:How to save the world.