Beware the Batman (2013)

S1E6 Toxic

Batman races against time to rescue Rex Mason, who faces a dire transformation into the villain Metamorpho after accidentally consuming a lethal amount of toxic chemicals. As the situation escalates, Batman must navigate the treacherous effects of the chemicals and find a way to reverse the transformation before Rex is lost to the sinister powers that threaten to consume him. The stakes are high as Batman confronts the dangers posed by the toxic substances and strives to save his friend from a fate worse than death.