She then proceeds to ask the Commission about Meteora, which they initially deny they know anything about. Meanwhile, Ludo and his minions, who are shopping there for a beak sharpener, pursue Star to try to take her wand. At the concert Jackie and Marco engage in a kiss, which results in Star running off out of jealousy. Star uses the seeing eye spell to find Glossaryck and pleads for him to come back, but he refuses, saying that he has to follow Ludo now. Marco gets a car ride with Oskar as they pursue Star to get her the wand. Moon and Meteora then fight and just as Meteora is about to win Eclipsa declares her love for her, which Moon uses as an opportunity to counterattack. Upon being put to work to grind corn, Buff Frog frees himself to discover who is enslaving the monsters.
They arrive at the monster temple, where they find Eclipsa's monster husband, Globgor, who has also been crystallized. Unfortunately for Ludo, this involves reuniting him with his former henchmen and rebuilding his old castle. Star takes the concept of going to battle literally, and booby traps the field with bombs, evil kittens, and giant birds. The other monsters are summoned for a fight but they are beaten up. 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.
Despite multiple attempts, he is unable to write into the book until he throws the book into the fire, at which it burns up. Unsatisfied, Buff Frog decides to leave along with his kids but then notices from behind the bleachers that his own kids as well as Mewman and monster children are having fun playing their own game of Cornball. Marco wants to follow the Buff Baby handbook, while Star just wants to cuddle them and poke at them. An interdimensional princess, from the kingdom of Mewni, named Star Butterfly is sent to a new dimension, the Earth dimension, to learn how to use her newest possession, the royal family wand, and she finds help along the way meeting an Earth boy named Marco Diaz, and she lives with Marco and his parents causing all kinds of interdimensional mischief. Jackie suspects that he is not letting go of this so easily, so Marco takes her out on a date to prove he has moved on and a better boyfriend to her.
Meanwhile, Ludo tries to activate his wand so he can fight off some rats at a tavern, learning that it works when he gets beat up and enraged. They eventually defeat it by turning on the lint blade catcher. However it proves to be real and attack them as they did not thank it that day. However, the location of the charger department proves extremely difficult to find and to get to. She then defeats Meteora and regresses her back into a baby. Just as Meteora was about to win, Eclipsa declares her love for her daughter, distracting her long enough for Moon to reverse the situation.
Toffee is revived, but he doesn't honor the deal. He parents decide to send her to Earth as a foreign exchange student to continue her training after she sets fire on the family castle. However, afterwards they discover that the pies from the festival were made using Moon's recipe, finally giving them a genuine clue. Toffee talks to Moon through Ludo and they make a deal; Toffee's finger for Star. Marco, in a last ditch attempt, uses Star's wand and activates the All-seeing eye spell. Baby then asks Star to bring her an apple using magic, but Star fails to do the task despite repeated tries.
As the ceremony is about to begin, Star discovers Globgor has escaped. Meanwhile, Ludo hears the voices from within the wand that tell him what he needs to master his wand. However, Star is reluctant to participate as it portrays princesses as being perfect, until Ruberiot reveals he wants to sing about the real her. After attempting to do the same by dancing with her other male dance partners, she then eventually confronts him alone to ask him why. As a distraught Dennis turns to leave, he is confronted by the castle's landowner, who reveals he tricked him into rebuilding it for him.
Meteora and Mariposa capture the two and take them to see Wyscan the Granter so that he can give Mariposa powers. He encounters the rats as well as Ludo, who offers him Meat Fork's job. Tom apologizes and tries to win back Marco with a Love Sentence song, and then raises Mackie Hands from the dead. However, as things change in the royal palace Star will soon learn that running the kingdom is far more complicated than she once thought. Unable to open the closet door, Star consults with Glossaryck who suggests she digs deep into her soul to use magic without her wand.
Meanwhile, the amnesiac Star and Moon fool around in the Realm of Magic, until the First-Born sends them away. However, Star convinces her to stop by pointing out that she will just prove herself to be the villain everyone claims her to be. To make things worse, she refuses to listen to Marco's request to pedal backwards since Marco had tricked Star into thinking he would not let go of the bike. They eventually defeat it by turning on the lint blade catcher. Marco forms a team composed of himself, Tom, Pony Head, Hekapoo, Talon and Kelly and attempt to trap her, but their plan fails and they are forced to flee with Meteora giving chase.
Star attempts to get the two to peacefully reconcile, only for them to immediately start fighting again as soon as she turns her back on them. With all their efforts, Star reassures him that she only named him squire so they can go on adventures again like they used to. Star asks why Eclipsa was crystallized, and is outraged that it was just because she married a monster. Tom fights back, but is no match in defeating it so the two leave immediately without the boot. Star is left with a new wand that is missing a piece. After getting excited over Earth activities such as using a flush toilet and playing miniature golf, he ends up overstaying his welcome. With wand and child in hand, Eclipsa takes off to who knows where.
But when he learns there is a secret chapter that Glossaryck withheld from him but showed Star, he makes Glossaryck unlock them. They arrive at the library, but are too late on returning it in time resulting in Kelly being forced to have her hair cut off as punishment. Believing they intend to retake the school, the princesses fight them but are defeated, with Meteora taking Pony Head's horn. The cube gets confused and lets them go. But, King Butterfly's antics get him in trouble several times with the park ranger. They then reveal that Moon had always done everything for them, causing her to change her mind and welcome the Maizleys.