Invasion from Space! Siren Comes Flying In

"Invasion from Space! Siren Comes Flying In" was the 16th episode of the fifth season of the Sailor Moon anime and the 182nd overall. It was first aired in Japan on August 3, 1996.

Summary
A mysterious little girl wearing an umbrella shows up at Tsukino's residence passing as Usagi's younger sister and two new Animamates take Iron Mouse's job of collecting Star Seeds.

Changes From the Manga

 * In the manga, Setsuna thought that Chibi Chibi was Usagi's daughter from the future.
 * Chibi Chibi's name was given unintentionally by Ikuko Tsukino.
 * Sailor Lead Crow and Sailor Aluminum Seiren didn't team up in the manga, and they never had civilian disguises either.

First Appearances

 * Chibi Chibi

Trivia

 * This episode included the first speaking roles of Sailor Lead Crow and Sailor Aluminum Siren.
 * This was the first appearance of Sailor Pluto in one of the episodes of the fifth season's main arc.
 * The decision to have the phage called "Sailor Cop" encased in metal may have been inspired by the Robocop series of films.