Overwhelmed by all the decisions she has to make, Marco offers to help by holding off Meteora while she goes after her mother. Buff Frog refuses and escapes with Meat Fork. . As the ceremony is about to begin, Star discovers Globgor has escaped. Star then finds Eclipsa, who puts the Spiderbites at ease by showing them Globgor's crystalized state. Having learned to keep impulsiveness in check, Star decides to stay for a bog party and going straight to Moon. He competes with a spider as they go ice fishing.
It is a Naysaya, a curse that Tom had placed on Marco so that Marco would not be able to ask out Star. Marco begins to dread Jackie Lynn's return as he felt that the relationship ended badly. The season concluded on April 7, 2018, with a two-part one hour finale. The second half of the season aired entirely in February 2017 on weekdays, with either a half-episode segment or a full episode premiering each day. Believing they have come to retake the school, the princesses fight them but are defeated, with Meteora taking Pony Head's horn. There they find some monsters that have taken over the place but see no sign of Ludo.
Ludo reads the forbidden chapter and gains some dark magic, but when he talks with Glossaryck, he now has the voice of Toffee, who has possessed him. They immediately leave with their manifested items and depart Quest Buy with bewildered expressions. It is then revealed that the whole scenario was set-up by Moon, Eclipsa, and Star to force the Commission to reveal the truth. However, Star is reluctant to participate as it portrays princesses as being perfect, until Ruberiot reveals he wants to sing about the real her. When Marco reveals he wanted to show Star the geyser, and the ranger says it's likely the last time it will ever erupt, the three try to rush there to see it.
Star and Buff Frog realize there may still be hope into proper integration. He then discovers he has sprouted a small little head out of the side of his neck that is saying all those things. Marco arrives, but River has to deal with angry villagers as well as a large monster who approaches the castle after he yelled at it to leave. However, Buff's youngest tadpole, Katrina, later sneaks Star out. The two families compete in Flags, a game where whoever plants their flag atop a dangerous hill full of obstacles gets to look down on the rival family members for a year. He also tames a bald eagle.
They eventually reach it, but it's revealed that, in order to break the curse, they will need to give up the memory of when they first developed feelings for each other. The fourth season has a few more half-hour episodes than prior seasons. However, it soon becomes a mock-trial where everything she says is used against her. Afterwards, Marco finally proves to Mariposa that they are siblings and that he loves her. He then discovers he has sprouted a small little head out of the side of his neck that is saying all those things. Moon was set to decide between signing a peace treaty or going to war against the monster army, led by Toffee. Ponyhead claims that her sisters are dangerous and scheming, but they appear very nice and kind, making Pony Head seem like the mean one, who eventually leaves in anger after an argument.
Marco turns to the Glossaryck, a genie inside Star's book of magic, for advice on how to stop her. Star risks her life and she saves Tom. However, she winds up turning her into a troll. Kelly however does noyt feel too inclined on joining in too long with their festivities, so she wanders off alone. Despite this, however, Moon still can not get herself to trust Eclipsa and decides to leave with River, choosing not to oppose her rule out of respect for Star's decision to cede the throne to her. Kim describes the music for each dimension as having a different sound and relating it to indie rock in Los Angeles.
Afterwards, Eclipsa reveals she has been searching for pieces of the Book of Spells to restore it and use the knowledge inside to help the kingdom. It is then revealed that the shape-shifting crow belongs to Mina Loveberry, who uses the armored boot to rebuild a full set of armor. 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. Encouraged by Rock's words, Spider is finally called to fight a monster'. Marco tricks Star into thinking the sayings in fortune cookies can really predict the future.
Inside Star finds memorials to past queens, including her mother, who is revealed to have fought Toffee and cut off his finger, as well as the ancient queen Eclipsa, who married a monster. Spider senses something in one portal, so Dennis ventures into it and finds Ludo having a mental breakdown in a makeshift home with their parents made up of various objects to keep himself company. However, she aims for his finger severing it, which he is unable to regenerate. 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. The second season was animated by Sugarcube and , both located in South Korea.