Clownfish are disappearing from the bay, so the girls spring into action to find out why. Could a mysterious diver be the culprit?
When the stone circle causes Cleo to forget that she can turn into a mermaid, Emma and Rikki scramble to keep her from transforming in public.
The girls and Bobby the dolphin untangle a mystery when Bobby's twin, Robby, is captured by someone in a mysterious speedboat.
When Lewis promises to tell his Valentine's Day sweetheart, Abby, a big secret, jealous Cleo fears he will give away the girls' mermaid identities.
Tired of the racket Miriam and Zane are making at their beach party, Bernie leaves his cave -- giving the Vandals a chance to move right in.
When her father goes to sea on a mission, Cleo's worries begin to affect her dreams. But could her nightmares be trying to tell her something?
To protect the White Mermaid, the girls guide explorer Stanley Finch to the underwater stone circle, whose magic makes Stanley think he's a pirate.
Emma's younger brother catches a glimpse of her mermaid tail and thinks he's seen a sea monster -- soon the whole town is in an uproar.
Lewis joins a famous explorer in a high-tech submarine to hunt for a sunken treasure ship, but a mishap strands them at the bottom of the sea.
When a spell forces Rikki to remain a mermaid until the next full moon, she has to find a way to lay low -- and underwater -- for three full days.
Having played one too many practical jokes, Teddy can't get anyone to believe his warning that an underwater volcano is about to erupt.
The mermaids turn to a cranky giant octopus for help when the Vandals invade the bay with a horde of stinging jellyfish.
Lewis is thrilled when the university hosts an underwater robot competition, but the girls fret over the safety of their marine friends.
An hour-long competition show that seeks to find the most talented and versatile body painters in the country.
Talia does some investigating to learn more about the magical spices.
Jase and the guys remove pests from other people's property Willie offers Sadie and John Luke jobs.
A concrete pourer who's gone from sleeping in a shack to kicking back in a mountaintop mansion; a young woman who's turned her childhood love of horses into a seven-figure steed empire; two best friends throw away junk.