The Stone Army The Stone Army is the twentieth episode of " " . Synopsis . The episode starts when an alarm clock wakes the ninja . Lloyd uses his powers to destroy the clock . and are reminded by Sensei Wu that they need to clean up after the Ultra Dragon . Knowing what this job would entail , Cole , Kai , Jay , and Zane try to stick Lloyd with the job . Lloyd , claiming that isn ' t fair , suggests that they settle it with a game of rock - paper - clamp ; Lloyd chooses rock and the ninja choose paper , winning and provoking Lloyd to state that it didn ' t make sense how paper could beat rock . As Lloyd prepares to clean up the Ultra Dragon , Nya appears and tells the ninja that the Great Devourer venom has brought some souvenirs at the museum to live , causing panic . The ninja and Wu leave immediately , with Lloyd sticking Nya with the job of cleaning up the Ultra Dragon . At the Museum , the ninja start attacking the miniature Stone Warrior souvenirs , which were made after the museum discovered a giant , four - armed Stone Warrior statue underneath the museum , which they planned to unveil officially later in the day . Though troublesome , the Ninja are able to easily fight the mini stone warriors . While chasing an escaping one , Wu runs into Misako , who is revealed to be Lloyd ' s mother . In the room that the statue was discovered beneath , Misako explains that she gave up Lloyd in order to learn more about the prophecy surrounding the Green Ninja , gaining information she could use to protect Lloyd when this came to be . She then tells the ninja the history of Ninjago , and the First Spinjitzu Master . Apparently , when the First Spinjitzu Master created Ninjago , though his intentions were all good , evil still had to rise to counter this good . This explains the origin of his antithesis , the Overlord . The First Spinjitzu Master and the Overlord , representing good and evil respectively , fought , though neither could gain the upper hand . Attempting to change this , the Overlord created a Stone Army out of an indestructible material . The First Spinjitzu Master , not wanting to risk losing against this army , split Ninjago into two , with the side containing the Overlord and the army drifting out to sea and being called The Dark Island . After that , Ninjago experienced years of peace . As Misako was telling this story , the Stone Warrior Statue was being officially unveiled . However , some more Great Devourer venom dripped down from the ceiling , bringing the statue to life . The statue started destroying the museum and causing havoc , eventually reaching the room that Wu , Misako , and the ninja were in . The ninja try destroying the Stone Warrior , but it appears to be indestructible . The ninja then try running from the statue , and are able to secure themselves within a room , temporarily keeping the Stone Warrior at bay . Knowing that the Stone Warrior will eventually break in , the ninja decide that , in order to protect Lloyd so he can still fight Garmadon , one of them will have to keep the Stone Warrior occupied while the others escape . They are about to use rock - paper - scissors to decide who that person would be , but this seems to give Lloyd an idea . He rushes off , telling the others to try and hold of the Stone Warrior a little bit longer . Eventually , Lloyd is finished , and direct the ninja on where to direct the Stone Warrior . The Stone Warrior chases the group , eventually reaching the same room that the ninja were originally in , though the hole from which the statue was unearthed is missing . Lloyd is standing in the back of the room , and the Stone Warrior runs towards them , but it turns out that the repaired " floor " was merely painted paper spread across the hole . The Stone Warrior falls through the paper and down the deep hole , and it is implied that it is destroyed upon reaching the bottom . Lloyd comments on how paper beats rock , revealing the importance of the rock - paper - scissor game in giving him the idea . The group then leaves , triumphant . While this was occurring , Garmadon had enlisted the Serpentine Generals in searching for The Dark Island using the Rattlecopter . The Serpentine , growing impatient , push Garmadon out of the copter and hail Skales as their new leader . Garmadon eventually washes up on The Dark Island , where the Overlord greets him . Garmadon is then instructed on how to raise the entire out of the water , as most of it had previously sank , and the Overlord promises Garmadon that he will rule Ninjago .