Star needs to be prepared for an evaluation that will determine whether she can stay on Earth. Marco misuses Star's dimensional scissors and gets himself into some trouble.
Star must find her way to relive her schoolmates spirit after she accidentally broke the school mascot's statue. Star, Marco, and Jackie attend a "Love Sentence" concert.
To take her mind off her strained relationship with Marco, Star ditches the Diaz's summer break party and joins her friends in a much more dangerous event.
When Star returns to her home dimension, she discovers that magic is disappearing throughout the kingdom. Star must dig deep and challenge her arch nemesis Ludo in an effort to save her family and kingdom.
Star secretly keeps Marco's hoodie as a reminder of their friendship and is not ready to let him go. Star has recurring visions of Glossaryck and believes he's haunting her.
Star and Tom's relationship is put to the test when Tom decides to get rid of his demons! Marco decides to put in a full effort to living life in the present on Earth.
Star urges the royal youth of Mewni to sign a petition calling for the equal treatment of Monsters. Star is thrilled when Ponyhead invites her to dinner with her sisters.
Star learns that Marco and Hekapoo have been dealing with rogue interdimensional portals. When Star's sleep-portaling becomes dangerous, she decides to end it.