Percy And The Haunted Mine is the 12th episode of the 6th Season.
Summary[]
Percy is terrified when he sees a mine chimney sinking into the ground and Donald and Douglas' stories about naughty gnomes do not help. Later, when Percy is to collect garden gnomes for a station, he sees the warehouse sink too, and is convinced it is the naughty gnomes, but they arn't naughty knomes they are garden knomes to decorate the station.[]