The Winx look for Peter Pan's son in London, but their efforts stall when Bloom is stalked by a nemesis created by the Queen to exploit her weakness.

To complete a mission, the team splits up: One group goes to the World of Dreams to save Jim, while the other hunts Matt in Paris.

After Musa faces off against her personal nemesis at Notre Dame, the team reunites to capture three escaped mermaids wreaking havoc in Paris.