| Mysterious Cardian |
|Romanji:||Nazo no Kaadian|
|Master:||Ail and An|
|Objective:||To gather energy for the Makai Tree|
|Death:||Sailor Moon's Moon Princess Halation|
|Anime:||After-School Trouble: Usagi Is a Target|
No name has been given to the Cardian; even official sources describe her as a "mysterious Cardian." Due to having to go after the Cardian and destroy it late at night to early in the morning, it caused the girls to be late for school in that episode.
- The Mysterious Caridan never appeared in the DiC English dub, as all scenes featuring it were removed.
- It's the first monster in the anime to be unnamed.