Star receives the royal magic wand but her parents panic and send her to Earth; Star's best friend from her home dimension visits and is threatened by Star's new friendship with an earthling named Marco.
Star's best friend from her home dimension pays a visit and feels threatened by Star's new friendship with Marco.
Star fails her first test, so she tries to play match maker for their classroom teacher to get a better grade. However, she winds up turning her into a troll.
While Marco is distracted by protecting his friend, the new school mascot, from being kidnapped by their football rivals, a confused Star believes this to be an upcoming battlefield and starts making plans of her own.
Marco breaks his arm before a Karate tournament. Star uses her wand to fix it, but accidentally gives him an evil sentient tentacle arm.
Star vies for attention with a foreign exchange student who is visiting the Diaz family.
Star is feeling down when her crush Oskar has no calls from her, so Marco tries to cheer her up only that he accidentally summons Ludo and his army of monsters.
Star and Marco must go to "Quest Buy", a maze-like store to find a charger for Star's wand.
Star and Marco have to try and save the Diazes from a multi headed serpent.
Star tries to fix Marco's arm with magic but accidentally turns it into a giant tentacle. The Diazes are visited by their former exchange student Gustav, and Star becomes jealous.
Star goes through mewberty, which covers her body in purple hearts and sets her off onto all the boys in school.
Marco and his friends work off their debt in the Shard Mines.
Ludo fires the lobster monster from his group and the creature doesn't know what to do, so Star and Marco try to help him out.
Star is sleepwalking and casting magic chaotically.
When her ex-boyfriend Tom's invites her to the Demon Prom, Star agrees to go with him.
Star manages to accidentally freeze time with her wand. Star's father pays an unexpected visit.
Star accidentally freezes time with her wand and then tries to convince Father Time to set things right.
Star's dad makes an unexpected visit and soon wears out his welcome.
Star must face her greatest fear and travel to St. Olga's Reform School for Wayward Princesses to bust out Flying Princess Pony Head for her birthday.
Star leads a battle reenactment as part of a Mewni Independence Day celebration.
Star sees a commercial for a magical Earth product.
Star leads a class field trip to a museum in another dimension and puts the entire class in danger.
When Star flubs the spell used to help Marco grow a beard, the beard grows out of control and engulf the house.
When Marco is captured by Toffee and held for wand-ransom, Star enters into an unlikely alliance with Ludo and Buff Frog.