User blog comment:RoyallyBella/Official Season 6 discussion blog/@comment-17292221-20131216095422

I don't know why the summaries/preview for episode 4 is different in this blog, but this is the summary from ITunes.

Episode 4:The Winx train in Aisha's new gym to prepare to fight without powers. Afterward, they return to Lynphea to fight the Treants and a flying Cloudtower. Flora saves her sister Miele, and gains her new transformation Bloomix!

Episode 5:Aisha and Stella work together as the Winx defeat the Treants, and earn their new Bloomix Power. Later, the Winx and Daphne tour the Golden Auditorium where they come face to face with a group of not-so-melodic sprites!

Both of these episodes aired in 15 December. Hope these informations helped :D!