The Space Tower is a weapon that appeared in Doraemon: Nobita's Space Heroes. Prior to the start of the movie, the leader of the notorious space pirates, Ikaros, lost his powers for some unknown reasons, and had to be kept in a special jar to stay alive. He wanted to enhance his devastated body with the purest coal in the galaxy, which stays in the core of the planet Arumasu, a diamond planet that reflects light from a star onto the neighboring planet Pokkuru.