Ghost Story Ghost Story is the 2nd episode in the fifth season , and the 46th episode overall of " " . Official Description . " When Morro gives chase to the Bounty and steals Wu ' s staff , Wu shares the story of Morro : the boy who wanted to be the Green Ninja - and the Ninja discover Wu ' s staff contained 3 symbols that lead to the Tomb of the First Spinjitzu Master which holds a mysterious relic that could alter the course of Ninjago . " Plot . As Morro catches up to the " Destiny ' s Bounty 2 . 0 " on his Elemental Dragon , Wu orders the Ninja to prepare for battle . The Ninja equipped themselves with weapons , since they lost their powers earlier that day . Jay mounts one of the cannons to fend him off , but the ghost eventually boards the ship . Morro then summoned twin ghost blades , and Cole and armed themselves with swords and hold him off while Zane and Kai take Wu below deck to make an imprint of the staff ' s secret message , leaving Nya , Cole , and Jay attempt to stop the possessed Green Ninja . Morro , however , cripples the autopilot and confronts Kai while the others attempt to stabilize the ship again . Kai is almost thrown out of the " Bounty " , but Wu tosses his staff away as a distraction and Morro summons his Elemental Dragon to retrieve it . The " Bounty " eventually crashes in the Forest of Tranquility , though the Bounty remains intact . After looking over the symbols , Zane sends the Falcon to fetch Misako for her to translate them . That night , Wu tells the Ninja of how he met Morro when the child was looking through the Monastery ' s trash cans in search of food . With Garmadon having left to train under Master Chen , Wu took pity on him and trained him in the ways of the Ninja . He soon discovered that Morro was a descendant of the Elemental Master of Wind and believed him to be the Green Ninja . This ended up being his greatest regret as the thought of the power that came with the title made Morro incredible arrogant and he flew into a fit of rage when the Golden Weapons did not react as they did when they eventually revealed Lloyd . He then left to find the Tomb of the First Spinjitzu Master to prove he ' s worthy of being the Green Ninja , but never came back . Wu , while sad he was sent to the Cursed Realm , tells the Ninja and Nya that they must stop Morro in order to free Lloyd and get their Elemental powers back . Meanwhile , Morro lands at a Biker Tavern and after having a drink , disrupts several bikers ' pool game to learn of the staff ' s secret message . He is soon surrounded by several bikers , but he uses the Allied Armor of Azure to summon Wrayth and the two defeat the bikers with ease . Morro sets off to the Library of Domu while Wrayth creates the Chain Cycle to hunt down the Ninja . That night , Kai dreams of him promising to look after Lloyd , only for the Green Ninja to be eaten by a Fangfish . He is awoken by a walliper to find that Misako has arrived and discovered that the first symbol means Airjitzu , a martial art created by Sensei Yang . Zane , however , reveals that the Airjitzu scrolls that are housed in Domu have recently been stolen by Ronin , though the Ninja realize that since Morro is unaware of that , they have a headstart . The Ninja mount on the wallipers to head to Ronin ' s home town of Stiix while Misako and Wu order Nya back with them to Steep Wisdom . Kai volunteers to lead the Ninja to Stiix . In Domu , Morro discovers the scroll is gone and asks a monk where it is . He begins to tell him about Sensei Yang , but after being intimidated by Morro , he reveals that Ronin took it , in which Morro sets off . In the middle of the desert , Kai is leading the team towards the sun , though Zane reveals to them that they are heading west , and Stiix is in the Eastern Coast : ergo , they should be moving away from the sun . Jay is stunned he ' s telling them now , though the Nindroid admits he wanted to let Kai lead . Cole berates Kai for going by gut instinct while Jay realizes the team looks to Kai whenever Lloyd is MIA when they should really follow Zane since he ' s a walking computer : Cole agrees since he ' s the more logical choice . Kai refuses to listen but is forced to follow because of his walliper . They soon find train tracks leading to Stiix and follow them . Back at Steep Wisdom , Nya sadly contemplates not being able to join the Ninja while Misako pushes Wu to tell her something . He says she ' s not ready to know though Misako points out how long he waited to tell the Ninja about Morro and tells Nya they didn ' t hold her back to fix the shop . Nya is surprised and asks why she was : Wu states there ' s something he never revealed about her parents though Nya stops him and reveals that Kai told her what Chen told him , which caused them to look into it and confirm their father was the previous Master of Fire which she isn ' t surprised by . Misako then points out that their mother was the previous Master of Water , which she is surprised by . Wu then says that since Kai took on the traits of their father to become the Fire Ninja , Nya must follow in their mother ' s footsteps and train to become the Water Ninja : upon hearing this , she drops the jar she ' s holding and faints causing Misako to realize she really wasn ' t ready to know . By nightfall , the Ninja find a train station to take a break . They are soon ambushed by Wrayth , who attacks them on the Chain Cycle . Wrayth turns Cole ' s walliper into a Ghost and the Ninja set the wallipers free . After a long battle which causes Wrayth ' s chain blade to get stuck in a support to a nearby water tower , a train to Stiix hits Wrayth , but since he is a ghost , he passes right through . However , the water from the water tower falls on Wrayth and he explodes into green goo . The Ninja soon discover that water is the ghosts ' weakness and the episode ends with the Ninja chasing a train to Stiix and telling them to slow down so they can get on .