Ghost Invasion

The Ghost Invasion was event that happened during the Possesion Arc.
== Events ==
* An exhibit about the ninja is opened at the Museum of History.
* Morro attacks the Night Watchman and possesses him to lure Adam in the museum.
* Wu attempts to retire from being a master and opens his own tea shop alongside Misako.
* Adam goes to the museum and Morro possesses him.
* Nick faces Morro to try and get to Adam.
* Nick hears Adam trying to fight Morro's possession.
* Morro and Wu fight for the staff. 
* Nick gets close to stopping Morro, but fails, and Morro gets the Staff of the First Spinjitzu Master, but not before Wu learns of the symbols engraved in its side.
* The ninja go to Stiix.
* The Ninja and Morro try to get the Scroll of Airjitzu from Ronin.
* Morro gets the Scroll and learns Airjitzu, and Ronin becomes a (somewhat) ally of the ninja.
* The ninja enter Master Yang's Temple looking for another scroll.
* The ninja learn Airjitzu.
* The ninja enter the Cloud Kingdom, only to be ambushed by the Ghost Warriors.
* Morro gets the Sword of Sanctuary, only for Nick to steal it back.
* Ronin steals the Sword and brings it to Morro to free his cursed soul from Soul Archer's debt, only to be swindled.
* The Caves of Despair is destroyed due to a chain reaction.
* The ninja and Morro look for the Tomb of the First Spinjitzu Master.
* The ninja see their future in an ice labyrinth.
* The ninja and Morro find the Tomb, and Morro gets the Realm Crystal.
* Morro and the Ghost Warriors invade Stiix.
* Morro opens the Cursed Realm to free the Preeminent.
* The Preeminent drags Adam into the Cursed Realm.
* Adam escapes with Garmadon and fights with Morro over the Realm Crystal, traveling through multiple realms in the process.
* Ian unlocks his True Potential and defeats the Preeminent. 
* This results in the deaths of the Anacondrai warriors and the Ghost Warriors, though Clouse maganes to escape. 
* The Preeminent attempts to drag Morro to his death, and Morro and Wu reconcile their pasts before Morro hands him the Realm Crystal and dissipates in the Sea.
* The ninja bring back Adam from the realm Morro left him in, with Adam ready to train to become a master.