One day, Dipper and Mabel Pine's satellite dish is suddenly destroyed after Mabel was watching My Little Pony and they go out to try to see who or WHAT did it. In the deepest part of the forest, a strange creature approaches them, demanding for a gem that they never had. They run back home and discover, in Dippers book, that the creature is a Draconequus. If this creature gets a hold of the gem, it may do damage to his world or even theirs.