S1, E3: Emma and Rikki love being mermaids and exploring the underwater realms but Cleo, with her fear of water, still won't go in. Out on one of their amazing mermaid adventures underwater, Emma and Rikki save a sea turtle from a fishing trawler's net, and they are mistaken for sharks! A shark hunt ensues. Cleo overcomes her fear of water to save another turtle but finds herself trapped in a fishing net. Emma and Rikki free her just in time. Cleo is saved and has also discovered how amazing it is under the sea as a mermaid.