Thora and the Green Sea-unicorn

Thora - half-mermaid, half-human - sails to London with her mermaid mother, and her newest friend, Shirley the sea horse. While in London, Thora encounters the aging actress and kleptomaniac Pamela Poutine. When Pamela finds out that Thora has the legendary projectionist's ring, she'll stop at nothing to get her hands on it.