Guest stars: as Spider, as Rock, as Narwahl Husband and as Make-up Blast. With wand and child in hand, Eclipsa takes off to who knows where. She invites Star and Marco to various dance clubs, but she competes with Marco for Star's attention and tries to strand him at a video arcade. When he chooses Jeremy to represent the dojo, Marco gets upset and tries to convince Sensei otherwise, but Sensei sticks with his choice. However, the location of the charger department proves extremely difficult to find and to get to. With a final attack, Eclipsa defeats Meteora, and the people of Mewni turn back to normal.
Although they cannot get into the theatre, Tom and Marco watch Mackie lay a beatdown on the movie's security guards. Ludo's minions Spider and Eagle volunteer by venturing into each portal, but to no success in finding him. However, the song reveals that she lost the Book of Spells and has a crush on Marco. The entire school is devastated. Marco uses a stick of butter that Ludo left to free himself, but River has eaten his part of the butter which leaves Marco with no choice but to steal Ludo's key. Marco, Kelly, and Jorby lure Meteora toward their trap, but Meteora steals Jorby's soul as well. Dennis unsuccessfully tries various ways to convince Ludo to come home, but Ludo ultimately comes to realize that he's just not ready to return home yet.
After everyone goes home, the discarded cube springs to life one last time, answering the question about Star's crush, but it gets destroyed before the audience gets a clear answer. Retrieved on 2018 February 28. However, Toffee arranges for the box imprisoning Marco to gradually collapse, forcing Star to destroy her wand in exchange for sparing Marco. While the stupidity of several of the royal personnel is a bit eye-rolling, it was intriguing to see Star reacting almost identically to her Mom in the earlier Season 3 story, Moon the Undaunted. She later encounters an underwater sea creature who tells her that hiding out is a good thing, but it is revealed the creature is actually her own conscience trying to convince her that she hasn't made a big mistake.
Calling her just queen ticks her off, because that makes it sound like they won't get her mother back. The show receiving hundreds of downvotes and an angry mob of Mewmans gathering outside Pony Head's house. After multiple failed attempts and different approaches, he ultimately throws the book into a fire in a fit of rage, destroying it along with Glossaryck. Meanwhile, Moon visits Ludo's parents and with help from his brother, Dennis, learns that he is at the monster temple and in possession of the other half of Star's wand. Eclipsa uses a spell that causes her and Rhombulus to switch bodies in order to undo Globgor's prison.
Meanwhile, Marco's Dojo Sensei wants his students to to. They fight and just as Star is about to be defeated Eclipsa takes her wand and regresses Meteora into a baby. Ludo and Toffee use a special floating eye device to spy on Star and her activities. Star is warned by a 'Bogbeast veteran' to listen for the bogbeasts song. However, they find he is not the culpit and go back to Sherry, but she turns herself to stone by drinking Yada Yada Berry Juice to avoid interrogation. However, behind Janna's back, Glossaryck takes Meteora back through time with help from former Magic High Commission member Reynaldo the Bald Pate. Star follows Mina and tries to train in her ways, which annoys Marco.
Upon retrieving her ledger, Moon finds that what has been haunting the castle all along was actually Mina Loveberry. She packs a large amount of stuff and goes to Buff Frog, who gives Star and Marco a map of Ludo's hideout. In the meantime, Eclipsa is put under house arrest. Miss Heinous says that just as the Princesses need her, she needs them, but the Princesses are unfazed by the truth, stating that his gender doesn't matter, as her message of being true to yourself is true as well, and chase Miss Heinous off once more. However, the box reveals they are lying and force them to tell the truth: Eclipsa's ex-husband, King Shastacan, had her replaced with Festivia, who was actually a peasant. They are then confronted by the Pie King, who reveals Moon and Star's ancestor, Queen Festivia, to have been Pie Folk, making them part-Pie Folk themselves. River then forces her to go on a hunt for the Bogbeast of Boggabah with him.
Pony Head eventually snaps out of her depression after her favority drama manages to get a happy ending. As Star leaves the concert, she fires a blast of tainted magic, destroying a billboard. King Butterfly joins them on the trip to learn what Earth camping is like. When they can't pay it, they are forced to work in a. Star begs Marco to use his Quest Buy. Remembering her pact with Eclipsa, Moon checks on her prison, which is still intact.
While doing so, an old woman appears with a camera having taken their photo and assuming they were a couple. Meanwhile, Ludo hires a monster named Toffee to shape up his minions. There they find some monsters that have taken over the place but see no sign of Ludo. At the same time, Miss Heinous barges in on them to get her revenge on Marco, only for her to recognize the chamber was once her old nursery as a young child. When they finally arrive, Star realizes that she left the camera and the Beach Day photo in the taxi and panics, but Marco suggests that they have fun anyway. Taking the parallels even further, Star storms out of the war room after being overwhelmed and is approached by her father, River, who also approached Moon when she was overwhelmed with her duties as queen.
Spider with a Top Hat's weapon runs out of ammunition after a few moments of sustained fire. Upon befriending Marco, Star ends up discovering his skills when she is attacked by Ludo and his army of monsters. She then agrees to get a horn transplant and returns to her former self, much to everyone's annoyance. In the end, everyone realizes Globgor is just a concerned father after he saves Meteora, who got caught in the crossfire. Ben then reveals that he actually locked them inside in hopes this would happen, having deduced they had feelings for each other. He competes with a giant spider as they go.
Encouraged by Rock's words, Spider is finally called to fight a monster'. She tries to cast some magic to get out of it but ends up in a. At the concert, everyone is having fun until couples start kissing, and when Jackie and Marco engage in a kiss, Star decides to let the two be. Marco, in a last ditch attempt, uses Star's wand and activates the All-seeing eye spell. All the time spent in the magical realm severely altered her mind and memories, making it impossible for her to return home of her volition.