The Staryummies, led by Obscurum, absorb all the energy of Lumenia's core, causing the star to sink into the darkness, but the Winx, thanks to their Cosmix powers, managed to give it back its light. Dorana hosts a party in honor of the Winx. However, the evil Valtor is preparing to attack Peripla, a star-ship that drives space travel for all the stars.
- The Winx fight against Obscurum along with his Staryummies and Starchomp.
- Obscurum steals all the light from Lumenia and the star falls into darkness.
- The Winx manage to restore the Core of Lumenia with their Cosmix powers.
- Valtor comes up with a plan to trap the Winx by attacking Peripla, using music as a bait.
- Valtor's Lair
- Trap Dimension
- Morphix Bubble - Used by Aisha against the Staryummies.
- Cosmix Magic - Used by Bloom against the Staryummies.
- Darkness Storm - Used by Obscurum against the Winx but failed.
- Cosmix Power - Used by the Winx to restore the Core of Lumenia.
- This episode was released on RaiPlay and RaiPlay Yoyo along with the first and second episode as a preview for its official premiere on April 15, 2019.
- This episode marks the return of Palladium's Potionology class since Season 6.
- It is revealed that Flora has a greenhouse in her dorm room.
- The font color used for this episode and previous episode's title card is different from the other episodes in the English version where it is in pink rather than being white.
- The Winx converging their power on the Core of Lumenia with the transformation theme playing in the background is a reference to "The Gifts of Destiny" where the Winx converge their Sophix to restore the Sacred Sprout.
- A poster of Tecna and Flora in their Season 5 attire can be seen in their dorm room.