Sailor Moon R

The season is divided into two arcs: One arc being an anime filler (to give Takeuchi Naoko time to make the next manga), and the other arc being the actual Black Moon plot. The first arc shows Usagi and Co. having their memories restored from the first season. Their enemies are a pair of aliens, Ail and Ann, who are seeking human energy to restore their life tree. Mamoru had yet to recover his memories and he appeared as the Moonlight Knight rather than Tuxedo Kamen. (myanimelist.net)