When Chemo breaks free at S.T.A.R. Labs, even Superman has his hands full. The toxic titan is slipperier than he looks and soon escapes into the surrounding wilderness. While the Man of Steel tries to track him down, Chemo searches for a little peace and quiet. Unfortunately, there's no rest for the radioactive. Can Superman contain the corrosive criminal before he causes an environmental disaster? Find out in this action-packed chapter book for DC Super Hero fans. Part of the DC Super Hero Adventures series.