Emma competes in a contest, Cleo is stuck babysitting an intern and save an injured sea turtle.

The girls discover of an ancient mermaid statue and return it but treasure hunters have another idea.

A storm threatens to wash out a birthday party.

Zane's father plans a luxury resort on Mako Island.

Aggressive blue seaweed attacks Emma.

Discarded plastic bags pose a threat to Teddy and his friends.

Atmospheric disturbances result in disastrous consequences.

Dolphin City is the location for a new movie.

Danny gets captured by the Oceanic Center for observation.

Lewis and the girls must find what's behind mysterious sound waves that are creating havoc.

Berk breaks a tooth and wanders near the beach in pain, causing a panic.

Rikki takes matters into her own hands by spying on her dad and his new girlfriend.