While carrying out research at the Eternal Archives, Hugo reads ‘The Most Boring Book Ever’ and unwittingly opens a portal to the Realm of Dreams, allowing a host of nightmare creatures to escape into Skylands. The Dream Sheep, an evil master of nightmares and the lead villain in the game, works with his sleepy sidekick the Sleep Dragon to conjure a powerful sleep spell which is spreading across Skylands putting everyone to sleep, while his evil flock of nightmare minions wreaks havoc. The Skylanders are immune to this sleep spell, and with the help of the Trap Masters, leading the charge in this new adventure, Portal Masters must seek out the nightmare villains and trap them before it’s too late!