Turns out there is more to Darkpoop Cola than meets the eye, and now Dib has been recruited into the inner circle of Poopwatch, a secret society dedicated to stopping the advance of dark forces who would use the power of Poop for evil. But can Dib get his hands on a bottle of Darkpoop before Gaz kills him? And what does this have to do with ZIM? The thrilling part two of a two-part two-parter!