Upon returning to Magix, the Winx learn from Faragonda in order to fight Tritannus, they must acquire a new, ancient power called Sirenix. Bloom insists the help of her sister Daphne, the last known fairy to earn the power, but little do they know a trap awaits them.
- Not the Fall That Kills You…: Sky survives falling from a great height while defending Bloom, but loses his memory.
- So Last Season: Since the Winx's Believix powers are not that effective underwater, Faragonda reveals they must earn Sirenix in order to fight Tritannus.
- Wham Episode: Faragonda reveals the Winx need a new transformation: Sirenix.
- Wham Line:Sky: (to Bloom) Who are you?
