Episode Title:
Invasion of the Bog Monsters / Now You See Me Now You Don't.
Episode Description:
Invasion of the Bog Monsters: Casper makes a whistle which makes a loud noise instead of a silent bat call. He gives it to Prof. Burns for his ear-drum bursting organ but he ends up attracting the bog monsters into scare school and they start turning everyone into bog monsters like themselves.
Now You See Me Now You Don't: Casper, Mantha and Ra get Frankengymteacher to believe that he can turn invisible to get them out of detention, which leads to him doing things that he would not do if people saw him. Alder and Dash find out that he has been "acting up" and suspended him.
