The Pegasus gives Chibi-usa and Usagi new brooches to transform directly into their super forms, as well as powers that they can apparently only use when they call him. He also eventually gives the Inner Senshi the abilities to transform into their super forms as well. The Inners don't get their new attacks until after the Amazoness Quartet shows up, however.

Pegasus is hiding in the Dream Mirror of a host, and in order to find him and take his crystal, the Trio is ordered to search the dream mirrors of the people of Tokyo. They do so, failing each time, except that Fisheye finally discovers that Chibi-usa is Pegasus's host. However, after talking to Mamoru and Usagi, he realizes that he has no dream mirror, and it's eventually revealed by Zirconia that the Trio isn't human. They are actually animal spirits in human-like bodies. The Trio are ordered to attack Usagi (who Zirconia thinks is the host), but while doing so, a lemure is sent to kill them. The Trio helps Usagi after her Dream Mirror is broken, giving up their lives to do so. (Fortunately for them, they have a happy ending. Pegasus gives them dream mirrors, making them human, and places the dream mirrors where they can remain in peace.)

The Amazoness Quartet appears after that with the same mission, only this time targeting the Golden Mirror, which is a bit more specific and indicates that Pegasus is hiding in it. After more searching and failing to find it, the Inner Senshi and Quartet confront each other after the Quartet decides to do mass Dream Mirror gathering. The Senshi then invade the Dead Moon Circus, and Chibimoon is kidnapped and Pegasus finally captured, his Golden Crystal taken. The Sailor Senshi manage to appeal to the Quartet, who realize that they have been used all along by Neherenia. The senshi then have it out with Neherenia. Moon and Chibimoon gain possession of the crystal thanks to the Quartet, who switches it with a pineapple when Neherenia isn't looking. Chibimoon calls upon the power of the children of the Earth and invokes the crystal's power. However, Neherenia has not yet lost, kidnapping Chibimoon again, Moon following. Neherenia throws Chibimoon off the cliff (they're on a floating piece of the circus headquarters in the air), and as Moon jumps off to rescue her, Neherenia seals herself into a mirror to remain beautiful forever and leaves. Moon manages to wake Chibimoon up just as they're falling past buildings of Tokyo, which causes Pegasus to arrive and save them.

The season ends with Pegasus, who the senshi discover is really Elios, guardian of Elysion and Endymion, leaving, and the Quartet becoming normal girls.