But as he leaves, Star is able to find her magic and come out to Mewni. He also obtains a wand of his own which holds the other half of Star's wand magic. Marco admits he likes Jackie, but the cube gets angrier, insisting someone else is lying. Marco meets Jackie again but the Naysaya starts to act up, so Marco decides to spill out all his insecurities in front of Jackie. However, she winds up turning her into a troll.
Afterward, wanting to prove her wrong, Moon decides not to solve all her people's problems anymore and lets Mina be as she goes after Eclipsa. He reveals that Star's tapestry is finally finished, revealing that she successfully destroys magic. Tom decides to give Star some space until she figures out her life. At a park, when Mina announces she plans to take over the world, the people decide to hold a vote on whether Mina should rule, and Star is left to break the tie. Queen Moon agrees to return Toffee's finger in exchange for Star's freedom. She is given the special family wand on her 14th birthday. When Star is unable to use the breaks of Marco's bicycle to stop and doesn't have her wand with her, Marco enlists Oskar and Glossaryck for help.
Marco tries to keep up with Star and later tries to convince her to stop when he realizes how serious the participants are in winning. Star wants to sneak out to fight, so she gets Buff Frog to distract her mom with some Mewnian board games such as Puddle Defender, which Buff and Moon find have a biased perspective towards the monsters instead of the Mewnians. 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. When Ludo hears Star's Wand is now in Eclipsa's possession, he finally snaps as he begins scheming on stealing it and openly tells Dennis he hates the castle. They start partying and raise enough funds to save the place, however the owner Milly tells them that she is still closing the place because she is tired from having partied over 5,000 years. However, Toffee arranges for the box imprisoning Marco to gradually collapse, forcing Star to destroy her wand in exchange for sparing Marco. After Star defeats them, Ludo is shocked when he is overthrown by Toffee.
She allies with and Ludo to storm the castle and beat up Ludo's former minions and free Marco. However, Eclipsa then flees with Meteora and Glossaryck, whose amnesia is revealed to have been just an act. At the end Tom's mom takes the last photo of Star and Tom for the photo album and explains that the rain appeared because of her emotions. Tom arrives to show Star a giant portal in the sky. When Star tells everyone what is happening, the audience is angry with Star for ruining the magic show and leaves. The sad moment is ruined when Tom attempts to return home and his portal will not work.
Unknown to him, Star has been keeping his hoodie, but arrives and throws it into the Royal Laundry for cleaning. Tom answers by saying he's giving her space since he was present during Song Day, from which he misinterpreted that she and Marco are in a relationship. Unfortunately, they go back too far and end up meeting the first Mewmen settlers of Mewni, who Glossaryck gifts the Royal Magic Wand to help them defend themselves. After getting excited over Earth activities such as using a flush toilet and playing miniature golf, he ends up overstaying his welcome. Although Tom and Janna retrieve the boot back, the crow refuses to let them leave and shape-shifts into an oversized crow monster. Pony Head approves of this and insists that he does everything to maintain the facade of Princess Turdina, but Star wants him to reveal the truth.
And most importantly will be able to accept the surrounding so sweet, but at the same time and dangerous Princess at or Old still be able to cope with his strength and do not do anything stupid? 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. He competes with a spider as they go ice fishing. Meanwhile, Ludo and his minions, who are shopping there for a beak sharpener, pursue Star to try to take her wand. 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. She then asks the Commission about Meteora and they deny to know anything. Eventually, the two work out their stress, but Tom still cannot leave.
When Marco disrupts Tom's plan to take Star for himself under the Blood Moon's light, Tom reverts to his old self. They then arrive at their actual destination, where they meet a younger Toffee building up his monster army. Realizing how much his brother has done for him, Ludo steals the deed to the castle and continues the reconstruction with Dennis and their other siblings. Ponyhead informs Star that Kelly and Talon returned to their respective dimensions while the High Commission most likely perished along with Glossaryck. Things get complicated when the tadpoles sprout their legs and hop around. Everyone, with the exception of Tom, then has their soul drained.
During the event, they meet fellow shoppers who will stop at nothing to get the best knight gear. Terrified of her, Rasticore tries to flee, but Meteora destroys Gemini, revealing that he is a robot, and the resulting explosion reduces him back to an arm. A two-hour television film called The Battle for Mewni, which comprises the first four episodes of the third season, premiered on July 15, 2017. Afterwards, Marco finally proves to Mariposa that they are siblings and that he loves her. Tom claims he has turned over a new leaf, having hired an anger management consultant. .
Meanwhile, Ludo hears the voices from within the wand that tell him what he needs to master his wand. Realizing how Denis has tried to help him, Ludo steals the deed to the castle and continues the reconstruction with his brother, and their other siblings. Pony Head is jealous that Marco is Star's best friend on Earth. 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. Eclipsa reveals that she knew that Moon planned Globgor's escape at her coronation and suggests that they either wait out Mewni's destruction or go back and fight.