Ep 6. The Mermaid Queen

In Winx Club season 3 episode 6 titled "The Mermaid Queen," the Winx Club girls embark on a new adventure as they travel to Melody, the underwater world, to obtain the last ingredient for their magic potion. The girls need to retrieve a pearl from the Mermaid Queen's throne in order to complete their potion and save Bloom's birth parents from the malevolent clutches of Valtor.

Once the girls arrive in Melody, they encounter the inhabitants of the underwater world. The area is full of colorful marine creatures, from the pretty mermaids to the fierce sea monsters. The girls are surprised to discover that the mermaids are not very happy with the way they have been treated by the surface world, and they are reluctant to help the Winx Club.

The Winx girls are determined to complete their mission and set out to find the Mermaid Queen's palace. They are greeted by numerous challenges on their journey, including dangerous sea creatures and treacherous underwater currents. The girls work together to overcome these obstacles and finally arrive at the palace.

However, their journey is not over yet. The Mermaid Queen has her own agenda and poses more challenges for the girls to retrieve the pearl. The Queen puts the girls through a series of mind-bending riddles and tests. The girls have to use their magical powers and their intelligence to solve each of the Queen's challenges.

As they pass each test, the girls learn more about the Mermaid Queen and the reasons behind her reluctance to help them. They discover that the Queen is heartbroken over the way her people have been treated by the surface world. The girls try to explain that they are not like other humans and that they are only trying to save Bloom's birth parents. They hope to persuade the Mermaid Queen to help them in their mission.

Eventually, the girls win the approval of the Mermaid Queen and are granted access to the pearl. They complete their mission and return to the surface world with the final ingredient for their magic potion. However, their adventures are far from over. Valtor is still out there, and the girls have to find a way to stop him and save Bloom's birth parents once and for all.