The magic tree house takes Jack and Annie back in time to feudal Japan where the siblings learn about the ways of the Ninja.

"Before Cat Ninja became Metro City's greatest defender, he was tiny, adorable Kitten Ninja and he battled...much tinier foes. (Everybody starts somewhere, right?)."--

Tiger Moth and his sidekick, Kung Pow, visit a dung beetle ranch owned by Tiger's Uncle Aphid, but when they arrive, the beetles are missing. It looks like the work of Stinky McCree. Tiger is convinced, however, that somewhere out among the desert cacti, a darker evil lurks.

Far away from Ninjago City, a village is terrorized by a mysterious new threat when they're saved by a stranger with incredible power known as adon, Lord of Destruction?! Has Garmadon turned over a new leaf since his disappearance, or is this just the first step in his master plan of finally defeating Master Wu and the ninja forever?

"Villains are flooding into Metro City, and it doesn't take a criminal mastermind to realize they're all after the same thing--Cat ninja! Plus Leon brings home a mystery egg that hatches into an excitable owlet named Hoot, confronting our hero with his biggest challenge yet: babysitting! When Cat ninja discovers Hoot's connection to the sudden wave of baddies, he'll need his paw-some family's help to save the baby owl, the city...and the future"--Back...

"Cat Ninja: Wanted features Metro City's favorites and newcomers in tales that include a nearly cat-astrophic case of stolen identity, the not-so-villainous adventures of Master Hamster, and Adonis's first mission as one of the good guys. Enjoy six stand-alone stories, plus a five-part Cat Ninja special miniseries! "--Amazon.

"In Cat's Claw, a new band of baddies comes to town looking to settle an old score, and Cat Ninja gets some help from his friends--the vaguely villainous and the half-heartedly heroic--to face them in this four-part tale."--

"Jay, cole, Zane, Kai, and Sensei Wu are strangers in an even stranger land-- Garmadon City! But the name is not what's strange! The fact that everything is made of stone-- the streets, the buildings, the trees, even the people!-- that's the really strange part. But how do you save people who have been turned into stone who don't want to be saved, and will do anything to stop you?" -- p. [4] of cover.

In the village of Konohagakure, school is literally a battlefield where classmates are ninjas-in-training competing to become the greatest ninja in the land.

The Masters of Spinjitzu are stuck on a comet, having traveled through space to save the World of Ninjago from the Nindroids. As they race through the stars, it becomes apparent that they are not alone on the comet. Something has stowed away, something not of their world.