The 999 arrives at the Dual Planets, a world full of machine people. When a large group of machine people at a restaurant treat Tetsuro and Maetel rudely, Tetsuro goes on a rampage and kills them all. Tetsuro and Maetel then meet Lala, a machine woman who steals Tetsuro's body, switching it with her own. When Maetel tells her to switch the bodies back, she instead brings them to a doctor who tries to steal Maetel's body. Luckily Maetel is able to force them to switch Tetsuro's body back, then she blows up both planets as they depart.