After saving Nya, the Ninja are arrested and put on trial! Despite the help of their lawyer Dareth, the Ninja are sentenced to five years in Kryptarium Prison. While they are in prison, a mysterious masked messenger visits Llyod and reveals that the Crystal King is gathering all the enemies of the Ninja and plans to destroy NINJAGO City!
Can the Ninja save NINJAGO City from the Crystal King's evil plan?