Winx club episode 5 season 5?

I thought 'The Lilo' was the first episode of season 5.... but it turns out it will be episode 5. Nick just used 'The Lilo' as a premier since it was the first special for season 5. That explains a lot since I didn't understand how the Trix were back and how there wasn't even an introduction to the season. Or the fact that Mitzi and her sister randomly appear, or how the Winx were at Alfea because I recall that the Winx had decided to stay on earth. SO... lets just wait and see ! :)