Kaos has blown up the walls of the feared Cloudcracker Prison, freeing Chompy Mage, Wolfgang, Golden Queen, Chef Pepper Jack, Dr. Krankcase, Gulper, Dreamcatcher, Nightshade and Luminous - The Doom Raiders, the most notorious villains in Skylands. Now it's up to Snap Shot, Wallop, Jawbreaker, Wildfire, Gearshift, Krypt King, Gusto, Lob Star, Bushwhack, Head Rush, Ka-Boom, Blastermind, Tuff Luck, Knight Mare, Knight Light, Thunderbolt, Short Cut, Enigma (along with Peach Rabbid, and Beep-0) and the rest of the gang to find and capture them. Using Traptainium, a magic material that can harness the power of the elements, they now have the amazing ability to trap the villains and return them to Skylands to fight for them. The Trap Team must begin the ultimate adventure as they explore the world of Skylands in search of the escaped villains (I won't include everything that belongs in the game, Mario+Rabbids Kingdom Battle belongs to Ubisoft, Skylanders belongs to Activision).
Skylands. A wonderous world filled with magic and adventure. An endless expanse of clouds and fantastic floating islands. At the center of the world sits the Core of Light, which keeps darkness at bay and peace within Skylands. Only when the Core of Light fails to function, darkness creeps in to engulf Skylands.
In Skylands, countless minions of the darkness and the Dark Portal Master himself, Kaos, battle for control against the Skylanders, guardians of the sky world. Most of the time, Master Eon and the Skylanders are able to maintain peace, but Kaos is always looking for ways to enact his devious plans.
This time, Chef Pepper Jack has got his hands on the Book of Dark Magic, thanks to Kaos. With this powerful spell book, he can use it to turn the Reformed Villains back to the way they were, turning them back to evil so he and the rest of the Doom Raiders can do some evil things, like rampaging and terrorizing Skylands.
But Chef Pepper Jack's plans backfire! The portals start erupting one by one, and soon create a huge space explosion, so powerful that it causes a rift between dimensions! The rift starts pulling in entities from all corners of space, including things that don't belong...
And with it, the Portal Masters from Earth are suddenly transported into Skylands! As for the Reformed Villains and the Skylanders, their adventure with the Portal Masters has begun!