This episode was really spot on. The girls finally return to Alfea, and Flora/Musa/Tecna bond with their Pixies (Chatta, Tune and Digit). I don't know, but I always found the bonding fun to look forward to.
Later in the episode shows a large dark tower being spotted in the water, and the girls attempt to destroy it. Yet the all fail to do so, and their magic is abosbed by an unknown wizard. He later turns out to be the new teacher at Alfea, Professor Avalon; the same paladin that rescued Bloom, Stella, Layla and Sky from the Witches in Shadow Haunt.
At the end of the episode, there's a party for Avalon, and everyone's dying to know who he's planning to assign for his classes. Then Stall butts in and says "Last time I checked, this was a party, not a classroom! So less chit chat, more cha cha!"
Then cue the laughing. xD I surely did.