Candle but is captured by Tom, and must duel Tom to get his freedom. Pony Head is jealous that Marco is Star's best friend on Earth. Despite some hesitation, Star and Marco go through with it anyway and they seemingly go back to just seeing each other as friends. In the same month, the series was renewed for a fourth season. Marco challenges the librarian to a fight to defend her, so the fight ensues.
Star later visits her and they start a friendship. It leaves peacefully, but as River is about to have a party to celebrate, Ludo and his minions appear and they take over the kingdom. On Song Day, a large crowd, including Marco, Star's parents and the Magic High Commission, gather to hear Star's song. But, King Butterfly's antics get him in trouble several times with the park ranger. Diaz after eating his family and all the trick-or-treaters. 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. He soon has a Mewni painter paint a portrait of him as a present to his new sibling, but the painter gets his image wrong, and the distorted magic painting disfigures him.
He wakes her up and with the help of Glossryck and Eclipsa, they manage to return to Mewni. He encounters the rats as well as Ludo, who offers him Meat Fork's job. Star apologizes to Marco and as an act of good faith, she magically creates an exact replica of his bedroom in the castle and appoints him as her own squire. They then arrive at their actual destination, where they meet a younger Toffee building up his monster army. Star begs Marco to use his Quest Buy. Star rushes in and reveals that her communication device cannot pick up Moon or Ponyhead's devices, and she declares that they need to return to Mewni.
Star and Jackie start bonding from wearing similar t-shirts and riding skateboards to the concert where they stop and help an animal in the creek. It is then shipped back to Earth where Marco receives it and is curious that his hoodie also has Star's scent. 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. Janna has a habit of teasing and lightly flirting with Marco, much to his chagrin. Star must solve the problem or her world will fall apart. There they find some monsters that have taken over the place but see no sign of Ludo.
The photo-booth eventually breaks down, locking them inside. That night Star hears the bogbeast's song and rushes after it getting trapped in mud. While Ludo is initially horrified at what he had done, Toffee, through the wand, convinces him that the book was a distraction and that he is now ready to take Butterfly Castle. Star and her sisters try to cheer her up, but she runs away with them giving chase. Diaz saves everyone from Hungry Larry. Diaz tells Janna and Star to go home, and Marco points out that Star technically lives there, too. Star returns to the Diaz family where she meets Marco's newborn younger sister Mariposa.
Afterwards, Rhombulus angrily leaves, while Marco and Tom, seeing it is too late to go to the beach, make a kiddie pool to cheer Star up. وبعد تلك المشاحنات وعقب إنتصارهم على لودو وأتباعه تبدأ علاقتهما في التغير للجانب الأفضل. He does chide Rafael for being rude. The season concluded on April 7, 2018, with a two-part one hour finale. Star's birthday falls on Stump day, but she never celebrates it as she says that they must pray to the stump, but Marco decides to hold her birthday anyway, as no one except Star believes that the Stump is real. Glossaryck tells Star that this is a result of there being something inside the wand that does not belong there and that in order to fix it she must go inside to remove said something. Star and Marco rejoice, but the former suddenly feels unfulfilled as she still does not feel happy.
Although she could easily escape, she is convinced by Janna and the other detention students that she is the Mayor of Detention, and is assigned to help the students out with their needs. She tells her that she plans to help Eclipsa and Globgor, despite Moon's pessimism. The only young royal who has not signed it, is Rich Pigeon, so Star, Marco and Ponyhead go to convince him. Diaz is quite heartbroken when the kids at the beginning tell him that he's not scary. 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. Diaz and to eat up his wife, child and guest.
However, she winds up turning her into a troll. She then flies off with Meteora and Glossaryck, whose amnesia was just an act. Glossaryck appears and joins in the fun. Marco wants to follow the Buff Baby handbook, while Star just wants to cuddle them and poke at them. Tom suggests they flee to his realm, but seeing Meteora defeating River convinces Star that she must face her. She also has a liking for macabre things.
The Naysaya can only go away when it is appeased, so Marco tries giving it what it wants, which is some cereal, but it doesn't go away. This is a must watch series especially if you like shows such as Gravity Falls or Adventure Time. 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. Moon was set to decide between signing a peace treaty or going to war against the monster army, led by Toffee. Janna also shows herself to be very strategic when cutting class with Star.