Diaz is disappointed that none of the kids think his haunted house is scary. While trying to evade the police, Star encounters a woman by the river bank named Brigid who likes making things out of discarded hair and taking care of injured animals. She has to take care of the dog and find its owner. However, Star convinces her to stop by pointing out that she will just prove herself to be the villain everyone claims her to be. A similar thing happens here. Star continuously tries to bring her home, but eventually succumbs to the realm's effects herself.
Marco starts to feel bad about the mishaps he caused and wants them to go on without him, but Jackie and Star convince him otherwise. In the meantime, Eclipsa is put under house arrest. Marco arrives and uses his dimensional scissors, but it does not work, forcing Tom to spend the night. Afterwards, Marco finally proves to Mariposa that they are siblings and that he loves her. But the kids get scared and go missing; Star and Marco are attacked. Diaz, Hungry Larry invokes it by eating up his family and everyone inside. Moon is unable to put up with them and intends to force them out, only for them to leave on their own, as they are incapable of surviving in the wild.
However, Glossaryck is summoned to the Bureau of Magic; he tells Star not to turn to that page, and his consciousness is dragged away into another dimension. Star is left with a new wand that is missing a piece. Star eventually exits the wand after removing the something that does not inside of it, which is revealed to be Toffee's missing finger. She meets the expert on the subject, the Royal Monster Examiner, who initially seems to understand Star's point of view, but eventually reveals that she simply sees Monsters as animals and wants to put them in a sanctuary, by blowing up a dam and surrounding the monster village with water. When they return, they see Moon and Eclipsa locked in combat. 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.
Meanwhile, Marco is tasked to find Marisol and gets his hand stuck in a drain pipe. Diaz tells Janna and Star to go home, and Marco points out that Star technically lives there, too. She backs down at the last minute and she and Marco decide to fight Wyscan when he proves immune to Star and Meteora's magical powers. Diaz create the scariest Haunted House on the block. When Star tells everyone what is happening, the audience is angry with Star for ruining the magic show and leaves. With help from a local named Eddie, they eventually locate her and discover that she is now a huge monster as result of feeding on souls. Star wants to sneak out to fight, so she gets Buff Frog to distract Moon with some monster board games such as Puddle Defender, which Moon realizes is biased towards Mewmans, and Buff Frog accuses Moon of being biased towards monsters.
Mina begins beating down on Eclipsa as her bubble shield begins to crack under Mina's blade. Moon reveals that Mina is acting on her orders just as the rooster crows. Marco admits he likes Jackie, but the cube insists someone has lied, and informs that Marco wasn't the one who lied. Marco must earn the scissors by having to blow out the flame atop Hekapoo's head. Marco assumes that Rich Pigeon is merely a normal pigeon and tries to make him sign the petition, but accidentally breaks his leg. She sprouts hearts all over her body, and transforms into a butterfly creature that captures boys and steals them away.
As Meteora heads towards the castle, Star sends Marco to hold her off while she looks for her mother. The unicorn rises out to tell them to stop, but Oskar offers his car to the group to venture down into the magic dimension. He eventually reveals Spider's secret which is where he vented his frustrations at all the other spells when no one would get along with each other, and just as everyone is leaving, Seeing-Eye understands its mistakes and remedies the situation by showing other truthful scenes where everyone is expressing their love for each other. They eventually reach the sanctuary, but the well spring that is supposed to revive the Commission has been affected by the fritz. However, the location of the charger department proves extremely difficult to find and to get to. River then reveals that she is the Bogbeast as she is impulsive and runs headfirst into situations. 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.
However, Mina betrays Moon, being immune to her magic, and demands Globgor, Eclipsa and all other monsters as well as any monster sympathizers be taken and disposed of. It is also shown that she attempted to sneak in under a variety of disguises. However, she learns that Marco is not with her. Meanwhile, Eclipsa uses a spell to communicate with Globgor by entering his mind and the two go on a date. She eventually discovers the dog named Willoughby is actually an extra-dimensional being who didn't like life on her planet, so Star has her adopted by a strange lady named Lydia. Diaz's family away from him and taunting him, he made the kids adore Mr.
He wakes her up and with the help of Glossryck and Eclipsa, they manage to return to Mewni. Jackie suspects that he isn't letting go of these so easily, so Marco takes her out on a date to prove he's moved on and a better boyfriend to her. Feeling bad, they head to Britta's Tacos where Janna suddenly remembers what she did. Meanwhile, Marco, who is displeased of Candle's career suggestion of being the head janitor on Garbage Island, discovers that Mr. She tells her that she plans to help Eclipsa and Globgor, despite Moon's pessimism. Seeing their immortal leader wounded causes the monster army to panic and flee with Toffee following suit.
Marco meets Jackie again but the Naysaya starts to act up, so Marco decides to spill out all his insecurities in front of Jackie in an impassionate monologue. Moon, Eclipsa and Star then reveal that they had set the whole thing up. She tries to cast some magic to get out of it but ends up in a. Diaz and to eat up his wife, child and guest. 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. .