The evil leader of the Rulons, Krulos is a frog-like being that has one goal on his mind – world domination. In order to do that, Krulos must first eliminate the Dino-Riders, a task that he is happy to oblige. Krulos would like nothing more than to destroy his rival, Questar. Krulos runs a tight ship and rules by fear. None of his soldiers dare challenge his authority and anyone that does is forced to quickly rethink such a thought.