"Gone Baby Gone" is the second segment of the seventy-second episode of Star vs. the Forces of Evil. It premiered on April 28, 2019 alongside "Beach Day", and is the second segment of the sixteenth episode in the fourth season.
As Marco puts Meteora and Mariposa to bed, Hekapoo arrives and warns Marco against returning to Mewni due to some unspecified danger. However, she leaves the portal open and both babies crawl through. Marco and Star arrive in Hekapoo's dimension where they find that the two are now teenagers. Meteora and Mariposa capture the two and take them to see Wyscan the Granter so that he can give Mariposa magic powers of her own. She backs down at the last minute and she and Marco decide to fight Wyscan when he proves immune to Star and Meteora's magical powers. Afterwards, Marco finally proves to Mariposa that they are siblings and that he loves her. When Mariposa and Meteora decide that they want to stay in the dimension, Marco and Star convince them to come back for the food and he quietly puts them back to bed.
- Eden Sher as Star Butterfly
- Adam McArthur as Marco Diaz
- Zosia Mamet as Hekapoo
- Isabella Gomez as Mariposa Diaz (teenager)
- Bryana Salaz as Meteora Butterfly (teenager)
- July 26, 2019 (Southeast Asia)