武内直子
are a group of fictional characters in the "Sailor Moon" manga series created by Naoko Takeuchi. They are the villains of the series' fifth and final story arc, called "Stars" in the original manga and "Sailor Moon Sailor Stars" in its anime adaptation. Shadow Galactica is first introduced in chapter #43 "Stars 1", originally published in Japan's "Nakayoshi" magazine on March 28, 1996.