Episode Title:Monster Bash.Episode Description:Star decides to hold a party that unites both Mewmans and Monsters at an old palace, but when guests start disappearing one by one under unknown circumstances, she and Marco investigate. They soon discover in the palace's underground chamber that Mina Loveberry has been camping out capturing unsuspecting monsters to keep order. At the same time, Miss Heinous barges in on them to get her revenge on Marco, only for her to recognize the chamber was once her old nursery as a young child. In a stunning revelation to Star and Marco, Mina explains that Miss Heinous is - in actuality - Eclipsa's daughter Meteora, thus making her a Butterfly. Before Mina can capture Meteora, Star demands to know more, but it leads to a conflict between the two. The party guests flee as the Magic High Commission raid the palace, leaving Star only further curious about these turn of events. Miss Heinous is last seen fleeing into the woods where she readopts her true name as Meteora.