The Nightmare Monster - S1.E16

The scene starts with the witches summoning a nightmare gargoyle. It attacks each member of the Winx, (with the exception of Bloom), and gets stronger as each girl is drained from the nightmares. Lucky for us, Mirta (who's still stuck as a pumpkin) informs the girls what's really going on. On the second night, The girls prepare to ambush it, but the witches show up and completely pummel them. That is, until Faragonda appears, kicks the nightmare monster's butt, and chases the witches. The witches retreat only to discover that they are expelled from Cloudtower.