The main antagonist is the former Krimzon Guard commander Erol, first introduced in "Jak II", renamed Cyber-Errol. He is a cybernetic version of himself, as he was badly wounded in "Jak II" when he crashed into a supply of Eco barrels in an attempt to kill Jak. Sometime before the start of this game, he restarts the manufacturing of Krimzon Guard Deathbots, whose original factory was shut down during the events of the previous game. Errol launches a war against Haven City in tandem with the remaining Metal Head monsters, and later forges an alliance with the Dark Makers. He obtains a massive Dark Maker terraforming robot at the end of the game, with which he attempts to destroy the planet. The Terraformer is destroyed by Jak as it advances through the Wasteland towards Spargus City.