From season 9 onwards, Lord Dregg, an evil alien warlord from Dimension X, appeared as the new lead villain. He begins a propaganda campaign against the Turtles, turning the general population against them and in favor of him and his forces. Although Dregg is outed as a villain at the end of season 9, the Turtles are never able to regain the trust of the broader population, due to an earlier smear campaign by Burne and Vernon that wrongfully blamed the Turtles for the destruction of the Channel 6 building. Additionally, the Turtles began to suffer from mutations that temporarily transformed them into monstrous hulks with diminished intelligence, a problem that would not be completely resolved until season 10. The TMNT also gain a new ally in the form of Carter, a brash African American male who initially sought out Master Splinter for training in ninjitsu, but is eventually exposed to mutagen and contracts an incurable mutation disease.