 At an evil trade show, while using a device intended to concentrate his evil, Dr. Drakken inadvertently give his evilness to Ron Stoppable. Once back at his lair, Shego recognizes what s happened when Drakken can t build any evil inventions. Meanwhile, Ron has grasped his new evilness and intends to punish an annoying cousin of his at a family wedding. Shego crashes the party, recognizes that Ron utilizes evil better than Drakken, and kidnaps Ron and leaves Drakken with Kim. Kim and Drakken must then repair the device that caused the evil transfer, storm Drakken s lair, and take the evilness from Ron and put it back into Drakken.