Revoltize

Revoltization is a form of permanent evil mind control done by Revolta. Revolta planned to create a potion that would allow her to use it on the Ghoul School girls to turn them evil forever. However, her plan was eventually foiled by Shaggy, Scooby-Doo, and Scrappy-Doo.

Order of revoltization
Although none of the girls became permanently revoltized, they were partially revoltized when under the influence of the potion. The following list chronologically when each girl reacted to the potion:
 * Sibella: When she reacted, her expression changed from calm to angry, and her pupils becoming slit.
 * Elsa: When she reacted, her eyes started showing hypnotic rings
 * Phantasma: Similar to Sibella, although she just showed an angry expression
 * Winnie: Howls; this howl was heard by the Calloway cadets, which resulted in Revolta's downfall

It is unknown how Tanis was affected by the potion.

Order of freedom
Thanks to the efforts of Scooby, Shaggy, Scrappy, Matches, and the Calloway cadets, the girls were eventually freed from the spell. The following list is the order in which the girls were freed:
 * Tanis and Winnie: When Scooby and Shaggy first entered the room, they slid under their chairs, freeing them from the potion. Both of them gave of surprised looks when freed.
 * Elsa: Although not shown, she was presumably freed before Sibella because she was completely cured the scene after
 * Sibella: Tanis successfully was able to pull off the helmet from her head, with Sibella giving off a surprised look
 * Phantasma: Although she was still under the helmet during the fight with Revolta, after Elsa corrupted the potion, her expression changed from angry to happy, returning to normal

Successful Revoltization
None of the girls were successfully revoltized. However, Sibella was the only one who was temporarily revoltized after being removed from the potion. During her revoltized state, her eyes twitched and enlarged while screeching. However, she later returned to normal, as her exposure to the potion wasn't long enough. None of the other girls showed any effect of revoltization except Phantasma, although she was cured when the potion got corrupted.

Analysis

 * Sibella Dracula's Revoltization

Trivia

 * Winnie had the least exposure to the potion, being one of the last to be affected and was almost immediately (although inadvertently) rescued
 * Sibella had the most exposure to the potion, being the first one to be affected by it and being the last one rescued before the potion corrupted. It is possible that had Tanis pulled the helmet off slightly later, Sibella would have been permanently revoltized