The kids ignore Rosebuds warning and summon Bloody Marty from the ominous mirror world. Soon Squirt and Gretchen are trapped in the mirror and it is up to McGee to save his pals. The Bottom Dwellers summon a ghostly Groundskeeper to help take care of their soccer field. The groundskeeper takes his job very seriously and before they know it the campers are keeping off the grass to save their lives!