Together with Mia, Violetta arrives in Centopia. She calls herself Varia and claims to be a princess from another island who has lost her memory. When Varia learns that Mia plays a central role in Centopia, she becomes jealous.
The friends have assembled the four rings. They now have the key to the Rainbow Island, but where is the lock this key fits into? They have to decypher the runes engraved into the ring.
Mia meets Yuko and Mo at the Unicorn Meadow, where Onchao is playing with Esko and the other foals. Mia’s Oracle indicates that the fourth Ring might be in Panthea’s Palace.
When Mia lands in the elven crater, she notices that today is the day when each elf has a gift for his best friend. Because no one has a present for Xolana, Mo gives her the one he actually had prepared for Yuko.
An otter named Scrobbit steals one of the rings and escapes via the waterfall. Our heroes chase him to Polytheus’ island, and Mia demands that the otter return the ring of Polytheus.
The Oracle tells our heroes they should look for the next ring in the stars. Simo shows them a spot in the forest where they can watch the stars, but the night sky is cloudy. Tessandra tells them to go into the desert instead.
Mia, Yuko, and Mo leave for the Unicorn Meadow to pick up Onchao. Mia interprets the Oracle as telling them to go to the Windy Cliffs to start their search for the four Rings. They don’t notice Gargona spying on them.
When Mia arrives in Centopia, she has to learn that Onchao is missing. He had an argument with his mother Lyria about his father Ono and wanted to look after him.
Following Rixel’s last attack, Mia decides that she needs to find out more about the black oil. Phuddle wants to help, but placing the oil in his hands is too dangerous!
With a device procured from Polytheus, Rixel manipulates the animals in the crater to make them show him the secret tunnel. Mia and her friends have to master the chaos that the hypnotized animals cause in the Elf Crater.
Rixel destroys the pepper supplies in the Elven Crater, and Mia and co have to go into the mysterious black forest to replenish supplies. Raynor warns the Elves that a ghost protects the black forest.
Rixel and Gargona try to catch and hypnotize a dragon to use as air transport. The elves discover the plan and protect the dragons. But when the friends reach the dragon caves, the dragons see a danger in the elves.
Mia is looking for Onchao, who is still fighting for acceptance amongst Esko’s foal group. Rixel plans to get into the elven crater by waving the white flag.
Mia, Yuko, and Mo try to find proof that Rixel is playing a tricky game on them. While visiting his circus, they check out the backstage area, where they find animals held in captivity. Meanwhile, Onchao is captured by Gargona.