Trying to obtain the Gem of Self-Confidence, Aisha, Stella and Flora search in the oceans of Stella's home world, Solaria. Meanwhile, the Trix and Tritannus' mutants attack Gardenia to get more toxic pollution for Tritannus to be even stronger and more powerful. Bloom, Tecna, and Musa appear with their new Harmonix powers and stop them. In the end, the Winx obtain their first gem.

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