These Zombies are created in labs controlled by a shadow organization lead by Dr. Xenon. She has created zombies in vats and mass produced them all over the world. They are intelligent. Though it varies on interation. She is constantly improving her designs, arming them with laser cannons and chain guns. Giving them Armor, jetpacks, plasma swords, caustic gas, etc. Though these larger more heavily armed zombies are rare. She has been resurrecting GDA troops as experiment. No viruses are used.