While working on the Tietê river dredging, environmental engineer Mario Vianna had an accident due to a severe storm at the site making him fall into the fetid and polluted waters. He was taken by the current and disappeared. Days later, he woke up in a gallery of the sewers, saved by a stranger calling himself Master Grasshopper. He also realized that he could no longer see. The Master then explained that he suffered mutations due the toxins polluting the Tietê River, giving him a power to change color like chameleons but unfortunately also leaving him blind.