Chemical X

Chemical X is a key item in The Powerpuff Girls, the specific compound created by John Utonium while working for the Devon Group that granted the Powerpuff Girls with their superpowers.

Season 1
Reese Baum came to Townsville and immediately sought out John Utonium. She told him that she had come for the Chemical X, claiming she had right to it since it was crated in a Devon Group lab. Utonium refused, so Reese instead dropped by Elliott Meyer's office during a PST meeting in order to offer up the identity of the higher power as well as a way to stop the imminent demon summoning in Millennium Park by the Gangreen Gang in exchange for the Chemical X.