The "Big Hero 6: The Series" episodes 'City of Monsters' Parts One and Two feature some Mutant Monster transformations and reverts. Both feature a decent amount of process, so the episodes are worth checking out. One of the reverts is of an Electric Eel lady from a few episodes ago.
https://www.thewatchcartoononline.tv...n-2-episode-12
https://www.thewatchcartoononline.tv...sters-part-two