Upon his arrival Casper finds the Valley to be a colorful garden and he meets his great-aunt Spitzy, who the Ghostly Trio claimed were not allowed to talk about, and the other creatures who were banished there for refusing to scare humans.
Meanwhile, Alder and Dash plot to use a petrification potion to turn Kibosh into stone and take over the Underworld and Deedstown.
They test the potion on the Ghostly Trio, who arrive to meet the headmaster(s) after Casper's disappearance, before inviting Kibosh.
The headmasters are convinced to stop by their "ancle" (aunt and uncle in one) Belle and Murray, from the Valley of the Shadows, and when everyone is returned to their original forms Kibosh allows the creatures to be friends with "fleshies" every once in a while.
Ape Entertainment published a Casper's Scare School comic book that ran for two issues from October 2011 to June 2012.