Aired: 10/1/2015
Clownfish are disappearing from the bay, so the girls spring into action to find out why. A mysterious diver could be the culprit.
Aired: 10/2/2015
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.
Aired: 10/3/2015
Lewis promises to tell his Valentine's Day sweetheart, Abby, a big secret; Cleo is jealous and scared that he will give away the girls' mermaid identities.
Aired: 10/4/2015
The girls and Bobby the dolphin untangle a mystery when Bobby's twin, Robby, is captured by someone in a mysterious speedboat.
Aired: 10/5/2015
When her father goes to sea on a mission, Cleo's worries begin to affect her dreams. Her nightmares could be trying to tell her something.
Aired: 10/6/2015
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.
Aired: 10/7/2015
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.
Aired: 10/8/2015
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, for three full days.
Aired: 10/9/2015
Lewis is thrilled when the university hosts an underwater robot competition, but the girls fret over the safety of their marine friends.
Aired: 10/10/2015
Emma's younger brother catches a glimpse of her mermaid tail and thinks he's seen a sea monster, and soon the whole town is in an uproar.
Aired: 10/11/2015
The mermaids turn to a cranky giant octopus for help when the Vandals invade the bay with a horde of stinging jellyfish.
Aired: 10/12/2015
Having played one too many practical jokes, Teddy can't get anyone to believe his warning that an underwater volcano is about to erupt
Aired: 10/13/2015
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.
