Null was a business man who initially appeared to be little more then a minor enemy to the TMNT, he was involved in projects that were destructive to the environment, heading up projects that involved slash and burn destruction of the South American Rain Forest, and dumping Toxic Waste into the Ocean. It was soon revealed that Null had sold the Earth to the alien Warlord Maligna, making the deal through her generals Scul & Bean, and was trying to exterminate mankind. To this end he struck a deal with a group of demons known as the Four Horsemen. But Null's plans were thwarted by the combined efforts of the Teenage Mutant Ninja Turtles and Mutanimals however. Null later created a team of cyborgs known as the Gang of Four, this team murdered the Mutanimals, but were destroyed by the Ninja Turtles. Null ultimately died when the Ninja Turtles' latest member Slash. sacrificed himself to prevent Null and Maligna from escaping Maligna's hive ship when it was crashing into the sun.