Star receives a visit from Flying Princess Pony Head, her best friend from Mewni. Pony Head is jealous that Marco is Star's best friend on Earth. She invites Star and Marco to various dance clubs, but she competes with Marco for Star's attention and tries to strand him at a video arcade. Meanwhile, guards have been hot on Pony Head's trail. Eventually, King Pony Head arrives to have the guards take Pony Head to St. Olga's Reform School for Wayward Princesses.