Star's got stomach bugs.
When more hearts start to appear all over her body, Star realizes that she's about to go through Mewberty. And no, it's not like puberty for Earth humans—it's something much worse. Star needs to stay away from boys, which proves to be difficult. As Marco looks for Star's spell book for help, the changes in Mewberty affect not only Star, but put the entire school in danger!
Tropes
- Bizarre Alien Biology: When Star undergoes Mewberty, she transforms into a insect humanoid with six arms that can spray adhesive webbing and large wings. She retains her wings after her Mewberty phase, although they are much smaller than before and useless.
- Bread, Eggs, Milk, Squick: Oskar's songs are all about calling his mother out; it starts out with him saying, "Why don't you clean your room, Mom?" and then moving onto "I don't like your boyfriend, Mom." Suddenly we realize what he and Star have in common.
- Cardiovascular Love: Star's Mewberty makes purple heart markers pop up all over her body, and is aggravated by the presence of any boy. Star realizes that "Marco's a boooooy~!" and she commands him to leave her alone since his boyhood is aggravating her condition.
- Cold Turkeys Are Everywhere: Star hides in a locker to avoid boys, which is a problem when the male swim team do their workout right outside it.
- Does This Remind You of Anything?: Star's Mewberty wings come out undersized, much to her disappointment.
- Eating the Eye Candy: Mewberty forces Star to do this and makes the condition worse, which is a problem when the swim team exercises outside the locker where she is trapped.
- Food as Bribe: Glossaryck only helps magical princesses, but makes an exception for Marco and Janna in exchange for some pudding. It's not revealed what Janna was getting out of him.
- Gratuitous Spanish: Marco has to visit Ferguson in the middle of his Spanish class to ask where Star's spell book is. He understandably is only speaking Spanish for the class and politely asks Marco to do the same.
- Heart Symbol: Star's Mewberty causes purple, heart-shaped scales to spread all over her body, her cocoon forms into a giant heart before she hatches, her eyes become glowing hearts, and the webbing she shoots is covered in hearts.
- Human Aliens: The episode reminds the audience about the whole from another dimension aspect to Star.
- "I Know You're in There Somewhere" Fight: Marco tries this when Star attains her One-Winged Angel form, but Star can't respond and simply webs him to a locker before going after Oskar.
- Ludicrous Precision: Glossaryck predicts the end of Star's Mewberty down to the second (3:57 on the dot), though he messes with Marco by claiming it may last beyond that.
- Mating Season Mayhem: Mewman females such as Star go through a process known as "Mewberty." It starts with them shedding little hearts whenever they're around attractive boys, and ends with them transforming into a six-armed butterfly monster that captures and cocoons every male it comes across. Despite how horrifying the whole event is for everyone involved, apparently the best way to deal with it is to just let it run its course. After Star's Mewberty, she has tiny wings that she can barely use to flutter.
- Metamorphosis Monster: Star turns into a six-armed, butterfly-like creature during Mewberty. Glossaryck suggests the possibility that it could be permanent, though it's unclear if he was being serious about that.
- Noodle Incident: Ferguson had Star's wand book because she lost a bet to him. Marco is concerned about this but doesn't have time to press for details. On a related note, it's never explained why Ferguson gave the book to Janna.
- One-Winged Angel: Star's final form during Mewberty. Unlike most cases of the trope, however, Marco doesn't defeat it, but has to release her instead.
- Parental Bonus: Several.
- Star's hands getting all sticky due to Mewberty.
- Star telling Marco to stay away because "his little boy hands" are making things worse.
- The very physically fit swim team accidentally flaunting their posteriors towards Star while she's hiding in a locker.
- The reason the swim team is in the hallway in the first place? Poop. It's poop. Someone pooped in the pool.
- Hope asking Janna if the spellbook can "make (her) parents stop fighting."
- Oskar singing about how he's going to live in his car because he doesn't like his mom's boyfriends.
- Star begging Marco to keep her away from boys while she's undergoing Mewberty only to realize, "Marco's a booooooooy!"
- Power Degeneration: When Star's Mewberty wears off, the car she carried with her during the transformation falls down, with the wheels clearly damaged from the impact. After that, she discovers that she has grown tiny wings on her back, but her attempt to test them with Marco causes both to immediately hit the ground because they're much too small to support her, let alone two people.
- Puberty Superpower: After Mewberty is over, Star gets wings. Unfortunately, they're still too small to provide any lift.
- Sheathe Your Sword: According to Glossaryck, there is no stopping Mewberty; just let it run its course so it'll be over sooner.
- Ship Tease: Near the end, Marco almost cries when he thinks Star is gone forever. Then one of the heart stickers lands on his face, and she finally reverts back to normal. He quickly hugs her, and she hugs him back.
- Squee: Star does this when she realizes she's grown her Mewberty wings.
- Stating the Simple Solution: Star tries to simply go home when she realizes her Mewberty is starting, but she can't control herself and Marco trying to drag her off causes her to involuntarily web herself to a locker, preventing her from leaving.
- Unusually Uninteresting Sight: Oskar takes no notice of Star in her One-Winged Angel form, the school being covered in purple adhesive, boys running and hiding, or even himself and his car being lifted several hundred feet in the air, only to find himself and the car landing in their usual spot.
- Weirdness Magnet: Invoked when Marco asks if things will be "typical Star weird or destroy the school weird." Star assures him it's the latter.
- Winged Humanoid: Star becomes this temporarily during Mewberty. Once it's passed, she retains tiny wings that can flap but are too small to provide lift.
