Star vs. the Forces of Evil - Season 4, Episode 15: Ghost of Butterfly Castle
Trailer
It looks like the fourth season will be quite different, offering a series of adventures of the butterfly star and her best friend Marco Diaz. It is a new series of challenges that they continue together through their adventures in Mewni and explore new dimensions. Things seem to be different at the Royal Palace, where the Kingdom's administration will be more dangerous than everyone thinks.