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"Is Mystery" is the second segment of the twenty-third episode of Star vs. the Forces of Evil. It premiered on October 3, 2016 alongside "Spider With a Top ", and is the second segment of the tenth episode in the second season.
Worried about his tadpoles’ futures, Buff Frog investigates the hole in the Mewman force field.
- Star Butterfly and Marco Diaz are both completely absent for the first time, but Star is mentioned by Buff Frog at the end of the episode.