Star is talking to her parents on the mirror phone about her father's upcoming throne-sitting lectures. Her mother notices the Dimensional Scissors she got from Princess Pony Head, but Star manages to play it off as Earth scissors. After finish talking with her parents, Marco comes in and tells Star it's his parents' anniversary. Star feels bad because she didn't get them anything and thinks they're cool, much to Marco's disturbance.
Marco gives his parents fanny packs, which he apparently gifts them with every year. While he goes over what's in them, a guilty Star blurts out that she got them a trip to her home world, Mewni. Star takes everyone to Mewni and shows them the small villages, staying away from her castle so no one recognizes her. However, Star sees her father, so she drags the Diazes into the Forest of Certain Death. Mr. and Mrs. Diaz narrowly miss many dangers, including man-eating plants and monsters. Star spots her father tracking something and nervously tells Marco that she will take them home, but as soon as she turns back, Marco's parents are gone.
Star and Marco find a hydra, the Diazes' clothes, and movement in the hydra's stomach, coming to the conclusion that it ate Marco's parents. Star and Marco fight it off and defeat it by tangling its heads in knots. Just then, Star's father jumps in and slices the hydra's stomach open; the villagers recently devoured by the hydra are freed, but the Diazes are nowhere to be found. Star, Marco, and King Butterfly soon discover the Diazes enjoying a hot spring. Soon after, Star and her father confront each other. King Butterfly scolds Star for not staying on Earth as she was told, but Star points out that he's supposed to be giving a lecture. As it turns out, King Butterfly has been secretly fighting monsters to vent his frustrations, and Star realizes that she inherited her monster-fighting skills from him. They agree not to mention any of this to Star's mother and reconcile with a hug.
- Eden Sher as Star Butterfly
- Adam McArthur as Marco Diaz
- Artt Butler as Mr. Diaz
- Nia Vardalos as Mrs. Diaz
- Alan Tudyk as River Butterfly
- Grey DeLisle as Moon Butterfly
- The scene where the salesman flashes his cape open in front of the Diazes is similar to a scene from the film Hercules, where Hercules, Phil and Pegasus meet a sundial salesman who flashes his cape open, offering them a sundial.
- Star makes a visiting return to Mewni for the first time after being sent away in "Star Comes to Earth".
- It is revealed in this episode that King Butterfly likes to fight monsters.
- May 3, 2015 (Canada)
- May 14, 2015 (United Kingdom and Ireland)
- July 30, 2015 (Germany)
- August 10, 2015 (Australia)
- September 6, 2015 (Israel)
- October 9, 2015 (Turkey)
- October 23, 2015 (Poland)
- November 5, 2015 (Spain)
- December 6, 2015 (Southeast Asia)
- January 29, 2016 (Japan)