Gurren Lagann The Movie 2: The Lights in the Sky are Stars
Summary:
Seven years after the defeat of the Spiral King, Simon, Kamina, Yoko and the Dai-Gurren brigade must set out to the vastness of space to defeat a new threat and save the universe.
Far in the future, humans live underground for hundreds of years. There Simon, Kamina, and Yoko stumble across an artifact unlocking a huge mech allowing them to battle monsters on the surface.