Carthigans are a hostile alien race from the Cathage Citadel in another dimension. They see the bakugan as friends in combat. There bakugan are nothing like the ones from any other dimension. They are hostile just like the Carthigans and will stop at nothing to cleanse the world of the unpure Bakugan. Carthigan Bakugan are known as Purifiers or Carthagons
The first Carthigan will be seen in episode one - Avenging Keith (again kinda sorta) .