Monster High: Great Scarrier Reef
2016| 1h 11m| IMDb 6.5
When the ghouls get drawn into the school swimming pool which has been transformed into a portal, they find themselves transported to the Great Scarrier Reef and turned into mermaids! To enable the girls to return to reality, Lagoona must face her fears in the form of an old bully, win an underwater talent competition, and defeat the evil Posea, daughter of Poseidon.
Director: William Lau
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Streaming info last checked: 20 Jan 2026