"Total Eclipsa the Moon" is the second segment of the fiftieth episode of Star vs. the Forces of Evil. It premiered on March 3, 2018 alongside "The Bogbeast of Boggabah", and is the second segment of the fifteenth episode in the third season.
Moon enlists Eclipsa herself to access Mewni's most guarded records.
After throwing Star out of her office, Moon settles down to a bag of chips to calm her frustrations. Although she finds Star's claims about Miss Heinous being Eclipsa's daughter preposterous, she reluctantly decides to check it out in the end. She visits Eclipsa in her room, who is playing music with a guitar she made out of a skeleton. Moon brings up what Star told her, and shows Eclipsa the Butterfly family journal. According to the book it says that Festivia the Fun was Eclipsa's daughter, however she says her daughter was Meteora, and she had clovers on her cheeks and a tail. Moon is confused, as the book contains the complete history of the Butterfly family. Eclipsa suggests checking out the royal archive in the Bureaucracy of Magic, which contains more history than there is in the book. She offers to help her find it, but she at first awkwardly declines. Eclipsa was under castle arrest, and Moon would get into trouble if the Magic High Commission found out, but since she did not know where to go or have access she reluctantly accepted her help.
Hiding her under her dress, Moon sneaks Eclipsa into the Bureaucracy of Magic. They find the secret entrance to the archive in a coat closet, and nearly get caught by Sean the security guard until Moon accidentally erases his memory. Through the maze of a dozen passageways, Eclipsa sings a song that helps her remember which way to go. They make it to the royal archive which is behind a huge locked door. Unable to get in, Eclipsa crawls into a rat hole by the door. Moon tries to follow her, but gets stuck. So Eclipsa leaves her while she goes round to pull her through. As she waits, a spider, intrigued by her crown, winds down and hypnotizes her to sleep as it swings back and fourth. She wakes up after a while, and finds the spider has stolen her crown. Eclipsa finally shows up on the other side of the rat hole, and has opened the door from the inside. She pulls her out of the rat hole, and the two queens enter the royal archive.
Moon is amazed by the site of the royal archive, but is warned by Eclipsa to be careful as the place is rigged. According to her, the archive automatically records all that has ever happened to the royal family. They soon find the scroll with Eclipsa's history, and discover that all record history on Meteora has been erased and replaced with Festivia. Eclipsa is distraught by this, only for Moon to assure her they will get to the bottom of this. As they make their way out, Moon accidentally triggers the alarm. Moon and Eclipsa make it out of the archive and flee before the Magic High Commission shows up. Moon even gets her crown back from the spider. Upon returning to the palace, Moon suspects that Eclipsa's scroll had been altered to cover up something, and has good idea who did it. She also tells Eclipsa that her daughter may still be alive after three hundred years, just as Star comes in after her hunting trip with River.
- Eden Sher as Star Butterfly
- Grey DeLisle as Moon Butterfly
- Esmé Bianco as Eclipsa Butterfly
- Josh Sussman as Sean
- This episode and "The Bogbeast of Boggabah" take place at the same time.
- The episode's title is a play on the Bonnie Tyler song "Total Eclipse of the Heart".
- Eclipsa reveals that she never learned how to "dip down".
- Festivia Butterfly is revealed to not be Eclipsa's daughter and was adopted into the family.
- King Shastacan is the name of Eclipsa's Mewman ex-husband, as revealed by Eclipsa's scroll.
- When Moon and Eclipsa enter the coat closet, there is a pointed magician's hat on top of a box on the left side. This may be a reference to Mickey's sorcery hat from the Sorcerer's Apprentice segment of the 1940 Disney film Fantasia.
- This episode deals with the mature theme of adultery, as it is heavily implied that Eclipsa had an affair while she was still married.