On her 14th birthday, Princess Star Butterfly receives a magical wand, but when she sets fire to the castle, she is sent to Earth to train. There, she enrolls in Echo Creek Academy where the principal pairs her with Marco Diaz, a reputed "safe kid". Upon befriending Marco, Star ends up discovering his skills when she is attacked by Ludo and his army of monsters. 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.
| Name | Type | Role | |
|---|---|---|---|
| Michael Mullen | Writer | ||
| Ian Wasseluk | Writer | ||
| Artt Butler | Guest Star | Rafael Diaz (voice) | |
| Corey Burton | Guest Star | Joust Joust Revolution Announcer (voice) | |
| Dee Dee Rescher | Guest Star | Miss Skullnick (voice) | |
| Eddie Deezen | Guest Star | Squares (voice) | |
| Grey DeLisle | Guest Star | Queen Moon Butterfly / Additional Voices (voice) | |
| Daron Nefcy | Guest Star | Laser Puppies (voice) | |
| Jenny Slate | Guest Star | Pony Head (voice) | |
| Jeff Bennett | Guest Star | Principal Skeeves / Squares (voice) | |
| Fred Tatasciore | Guest Star | Buff Frog (voice) | |
| Nia Vardalos | Guest Star | Angie Diaz (voice) | |
| Maurice LaMarche | Guest Star | King Pony Head / Squares / St. Olga Guards (voice) | |
| Dave Wasson | Director | ||
| Michael Mullen | Director | ||
| Dave Barton Thomas | Director |