X-Terminator
The X-Terminator is a villain in the Hamster & Gretel episode "I'm Bored". He used to work in a science lab with a rat infestation, creating the most sophisticated rat trap ever conceived in response. When he was about to activate his device after he nearly got all of them, one lone rat managed to startle him, causing him to accidentally activate a merging machine from his lab partner, combining him with his rat trap and effectively turning him into a cyborg.
Since a rodent caused him to no longer be fully human, X-Terminator has sworn revenge against all rodents and desires to destroy them all, starting with Hamster, which he claims is the most powerful rodent.