Danny's ghost fighting has been causing him to be in a pickle, because he has to study for a test and not doing so has got him a D. Sam suggests that he should do extra credit by doing a report on the purple back gorilla, plus, Tucker put Danny's schedule in his PDA. But now Danny is in more trouble because a ghost hunter (whos a ghost) named Skulker has spotted Danny and is trying to capture him, and just as soon as Danny met his doom, Skulker spotted Tucker's PDA and attached it to his armor. He gains more power, but now he keeps flying off to a new location. ...