What he tries to innovate is "Neutralvirus," which turns an infected person into an ordinary person. He thinks causing the pandemic of Neutralvirus is the best way to eliminate any kind of discrimination. What made him to think this way is his childhood when his friends were bullied. Some of are bullied because of races or religions. Others are bullied because of handicaps. Rex was too kind not to be hurt by seeing them suffer. He isn't aware of it, but many think he is a villain.