"Powers Day"

The Ninja have all grown up and have started their own families and they all reside at the Monastery of Spinjitzu. Peace has been with the land for fifteen years. But when Lloyd's son starts acting strange and the children disappear, the Ninja have to journey to find them, recalling the stories of their children's births along the way.
When they discover shocking secrets about who and why their children were kidnapped, things won't go down without a fight.
But it may not be the fight they expected.