Trama

The vision reappears to Mimmi and Zac, this time speaking to them. Weilan learns a new detail about the dragon legend that suggests Nerissa is alive.

Ondina brings goods news from the Mermaid Council - they have a plan to defeat the water Dragon by entering the Moon Pool on the night of the full moon and unleashing the full power of Mako. Zac and Mimmi see another vision of their mother while they are at the Moon Pool. Mimmi is convinced their mother is still alive and is in need of their help. Weilan confirms her theory when she learns of a tale about a Chinese mermaid falling in love with a Land Boy who was turned into a Water Dragon as punishment. The mermaid was able to use a magic bracelet to break the spell and free him.

Mimmi believes Nerissa is trapped in the form of the Water Dragon and needs their help but Veridia and the Mermaid Council don't want to risk the pod by not destroying the Water Dragon. Desperate to get their hands on the gold bracelet, Ondina and Weilan find Rikki at the Moon Pool where they are finally able to convince her to help them.

As the full moon rises, the Water Dragon appears and begins to make its way to Mako Island. Armed with the bracelet, Mimmi faces off against the Water Dragon while Ondina and Weilan rush to the Moon Pool hoping to stop the Mermaid Council but it is too late to stop what they have started.

Mimmi unleashes the power of the gold braclet and in a blinding flash of light the Water Dragon is destroyed but Mimmi is gone as well. After a few anxious moments she emerges out of the water with her mother in her arms. Nerissa has been freed and is finally reunited with her children.

Back in the grotta, Nerissa recounts how Aurora used a spell to turn her into the Water Dragon and forced her to attack Weilan's pod. After a long slumber in which she dreamt of her children finding one another, Nerissa was eventually awoken when the spell was lifted by Zac and Mimmi's love.

In the aftermath of events, Zac informs his friends he plans to tell his parents the truth about who he is, Weilan helps a friend and recieves a Moon Ring of her own, Mimmi shares her secret with Chris, and the mermaids make plans for the future.