Star is mirror-chatting with Pony Head as it is her birthday. Star starts to sing the birthday song and Pony Head acts very happy about it. Happiness is showing your individuality so Pony Head is sent to solitude at St. Olga's Reform School for Wayward Princesses. As she hangs up from the mirror-chat Star turns to see Marco entering her bedroom. Star convinces him to come with her to help rescue Pony Head. After using the Dimensional Scissors to arrive at St. Olga's Star and Marco spot some new arrivals. They use the wand to transform their looks to blend in with the new arrivals. The two sneak into the school and disappear from the group.
They find that Pony Head has been transformed into a formal, fancy princess. All they have to do now is break the barrier that is blocking the usage of dimensional scissors. They are about to leave when a guard catches them. They run into a crowded hall full of princesses. Marco causes a distraction by starting a rebellion among the princesses. After that they manage to find a laundry chute and Star takes Pony Head down it. Marco gets caught by the guards who send him to solitude. He is forced to watch videos on how to become a princess. He tries to escape using a bobby pin but drops it on the floor. Meanwhile, Star thinks it's hopeless and starts to cry. While she is crying Pony Head starts to rip up a princess poster. She transforms back into her old self and the two decide to go rescue Marco.
Pony Head and Star break in and rescue Marco. They escape and break the barrier. Star and Marco are about to take Pony Head to the Bounce Lounge to go enjoy her birthday. Pony Head decides to stay back and help the other princesses escape so Star and Marco quickly return home. Miss Heinous, headmistress of St Olga's, finds the bobby pin Marco dropped in the solitude and puts it in a test tube to see where it came from. She discovers it's from Earth and is determined to destroy the two princesses who messed with her school.
- Eden Sher as Star Butterfly
- Adam McArthur as Marco Diaz
- Jenny Slate as Pony Head
- Jessica Walter as Miss Heinous
- Jodi Benson as Singing Teacher
- This is the second episode since "Party With a Pony" to feature Pony Head.
- Princess Smooshy from "Sleep Spells" makes a brief appearance in this episode.
- August 23, 2015 (Canada)
- November 17, 2015 (Poland)
- November 17, 2015 (Turkey)
- November 28, 2015 (Spain)
- January 25, 2016 (Israel)
- May 6, 2016 (Japan)
- June 3, 2016 (Southeast Asia)
- June 13, 2016 (Latin America)