Seasons & Episodes
The Secret of Mako Island
Cleo, Emma and Rikki get stranded on Mako island and fall into a magic pool where their lives change forever.
Caught in the Net
Emma competes in a contest, Cleo is stuck babysitting an intern and save an injured sea turtle.
The White Mermaid
The girls discover of an ancient mermaid statue and return it but treasure hunters have another idea.
A Stormy Party
A storm threatens to wash out a birthday party.
Mako Island Hotel
Zane's father plans a luxury resort on Mako Island.
The Mysterious Seaweed
Aggressive blue seaweed attacks Emma.
It's in the Bag!
Discarded plastic bags pose a threat to Teddy and his friends.
Dolphin City Triangle
Atmospheric disturbances result in disastrous consequences.
Poseidon's Daughter
Dolphin City is the location for a new movie.
Dolphin City Mascot
Danny gets captured by the Oceanic Center for observation.
Bad Waves
Lewis and the girls must find what's behind mysterious sound waves that are creating havoc.
Jaw-ache!
Berk breaks a tooth and wanders near the beach in pain, causing a panic.
The Lost Ring
Rikki takes matters into her own hands by spying on her dad and his new girlfriend.
Reported Missing
Clownfish are disappearing from the bay, so the girls spring into action to find out why. A mysterious diver could be th
Memory Lapsse
When the stone circle causes Cleo to forget that she can turn into a mermaid, Emma and Rikki scramble to keep her from t
Valentine's Day
Lewis promises to tell his Valentine's Day sweetheart, Abby, a big secret; Cleo is jealous and scared that he will give
Kidnapped!
The girls and Bobby the dolphin untangle a mystery when Bobby's twin, Robby, is captured by someone in a mysterious spee
A Strange Phenomenon
When her father goes to sea on a mission, Cleo's worries begin to affect her dreams. Her nightmares could be trying to t
Handle with Care
Tired of the racket Miriam and Zane are making at their beach party, Bernie leaves his cave giving the Vandals a chance
The Return of the White Mermaid
To protect the White Mermaid, the girls guide explorer Stanley Finch to the underwater stone circle, whose magic makes S
Three Days Underwater
When a spell forces Rikki to remain a mermaid until the next full moon, she has to find a way to lie low, and underwater
Robot Duel
Lewis is thrilled when the university hosts an underwater robot competition, but the girls fret over the safety of their
The Creature from the Bay
Emma's younger brother catches a glimpse of her mermaid tail and thinks he's seen a sea monster, and soon the whole town
Underwater Takeover
The mermaids turn to a cranky giant octopus for help when the Vandals invade the bay with a horde of stinging jellyfish.
Imminent Danger
Having played one too many practical jokes, Teddy can't get anyone to believe his warning that an underwater volcano is
Trapped
Lewis joins a famous explorer in a high-tech submarine to hunt for a sunken treasure ship, but a mishap strands them at
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