Bucky gets Stank'd

The Sorcerer, the ancient evil who is imprisoned underneath Norrisville High can literally sniff out peoples' negative emotions coming off people, which leaves them vulnerable to being "stank'd" into horrific monsters, both inside and out. Fortunately the way to "destank" a person is to destroy what they hold most dear, after which they revert back to normal.

Example of:
Villain-Possessed Bystander