Monster High: Great Scarrier Reef

When the ghoul friends get pulled into the school pool at the party of the year, they’re transported to the underwater world of the Great Scarrier Reef. There, they meet Posea Reef, the daughter of Poseidon and the guardian of all creatures of the deep. The ghouls find out that they can't get home until Lagoona faces her fears and fixes her freaky flaws.

She gets help from her ghoul friends as she confronts Kala Mer'ri - a frenemy from her past, gets over her stage fright in order to compete in a dance talent competition, and fights the Kraken - a terrible beast from the deep.