These Villains become available for use after you successfully complete the Boss Pursuit challenge on a track. For more information about Boss Pursuit, check out the “Racing” section later in this guide. Villains can race on any of the tracks of the same type (Land, Sea, or Sky) where you caught them. The Kaos Trophy unlocks Kaos for any Sky track. You never need to defeat him in a Boss Pursuit to make him available for use.
Unlike SuperChargers, Villains and their vehicles are not interchangeable. When you choose a Villain, you also choose their vehicle automatically. There are no mods to change the performance on the following vehicles but their attacks change when a Trap is placed in the Portal of Power. In addition, there are no weapon or shield upgrades to purchase. They are maxed out as soon as you obtain them.