Mako Mermaids: An H2O Adventure - Season 3

After Cam absorbs moon pool water, he's thrilled to discover that he has power over water, which gets him a place in the trials for the school swimming team. Zac and Evie try to talk Cam out of competing, but he refuses to listen. When Ondina attempts to remove Cam's power, she causes water to be uncontrollably attracted to him. Now the race is on for the mermaids to find a solution before Cam's aquatic magnetism is revealed to the world.

Ondina sneaks Erik into the grotto to duplicate a pearl he gave her with magic she has learned from Mimmi. But Ondina accidentally turns Erik into a copy of Poseidon and when she attempts to reverse the spell, she turns the two cats into four. Three cats escape from the grotto and the mermaids must find them and change them back, otherwise Erik may be stuck as a cat forever.

Cam realizes the shape of the pedestal in the merman chamber is identical to Mako Island, and that five decorative inlays on the pedestal correspond to five rock outcrops on Mako reef. When Erik dives to one of the outcrops and touches it, he vanishes, transported into a sphere of endless water with no way out. Zac and the mermaids help search for Erik. In the process of freeing him, Zac discovers the key to activating the merman chamber.

When Sirena sees an online video that shows a kayaker being lured by a Northern mermaid's song, she becomes enchanted. She starts to follow David obsessively, even disrupting him at school during an exam. By the time Mimmi works out what has happened, David has already fallen under Sirena's spell and she is luring him into the moon pool. The mermaids are just in time to prevent disaster. When the siren spell is broken, David has no memory of what happened.

A surprise birthday party is in the works for Evie, but Zac is so tight-lipped about it that she thinks he's forgotten. Mimmi tries to cheer Evie up by letting her try on her moon ring. Evie accidentally shrinks herself and falls into an aquarium, which Zac is giving her as a present. The mermaids bring the aquarium to the party without realising that Evie is inside. Evie struggles to get Zac or the mermaids to notice her, while hiding from everyone else.