On Sept. 11, 1995 — 30 years ago today — the Japanese animated character Sailor Moon and her team of guardians of the solar system made their debut on American TV. The character was already a hit among tween-aged girls in Japan on TV, manga comic magazines and supplemental art books. Here’s what you need to know about Usagi — or Serena, depending on what version you’re watching — Tsukino and her superpowered schoolmates.