14. Larfleeze
Larfleeze, also known as Agent Orange, is one of the main antagonists to the Green Lantern. What makes Larfleeze so intimidating is the fact that he can actually completely destroy the Guardians of the Galaxy. Since he is over a billion years old, he has harnessed some pretty incredible powers and energy. That means that the most powerful immortal beings in the galaxy fear this villain – talk about a truly intimidating bad guy!