Star Butterfly (Chloë Grace Moretz) is a magical princess from the dimension of Mewni. On her 14th birthday, she receives the family heirloom wand. However, after she accidentally sets her castle on fire, her parents decide that a safer option is to send her to Earth as a foreign exchange student. There, she befriends Marco Diaz (Kevin Quinn) and lives with his family while attending Echo Creek Academy. Star and Marco must deal with everyday school life, while protecting Star's heirloom wand from falling into the hands of Ludo (Benedict Cumberbatch) , a villain from Mewni who commands an army of monsters. Star returns to Mewni after she discovers that magic is disappearing throughout the kingdom. When Star discovers that her family’s history is linked to the use of dark magic and may be responsible for the monster mayhem in Mewni, she must dig deep and confront Ludo to save Marco, her family, and the kingdom.
