Zarm

Zarm is the Spirit of War and Destruction, who craves to destroy Gaia and Captain Planet. Throughout his five seasons of the show, he is voiced by three different actors: Sting, David Warner, and Malcolm McDowell.

While technically not an eco-villain out to exploit and/or destroy the environment and nature like most of the others, Zarm could be considered the most evil and dangerous one of them all. This is because he represents the evils and consequences of war, corruption, abuse of power, and hatred, which are more destructive and harmful to both the environment and people than anything else.