Sadakichi and his friends from the Pentagin Planet (惑星ペンタギンのサダ吉とその仲間達), alternatively known as "The Aliens", are a group of small aliens that came to Earth to establish a friendly relationship with the humans. But is that their true intention? They hail from the planet Pendagin, and the only one of them known by name so far is Sadakichi, who makes an appearance in CR Goketsuji Ichizoku as an event character. They sing the song Our Secrets, and most recently, a revised version of Kinta Kokuin's theme song called Wakusei Pentagin Boshi Enka in Goketsuji Ichizoku Matsuri Senzo Kuyou.