While protecting Ninjago City from daily threats, the Ninja encounters a new elemental master in league with an old enemy.

The Ninja defends the Cloud Kingdom from Ras and sees firsthand the power of his new weapon, the Gong of Shattering. 

Cinder and Jordana compete for Lord Ras's favor; the ninja set out to find a teacher who can defeat the Wolf Clan; Wyldfyre sneaks on the Destiny's Bounty.

The ninja find two old dragon masters who agree to train them; Ras invades the Land of Lost Things. 

Egalt teaches the Rising Dragon to the ninja; Sora and Riyu learn Spinjitzu from Rontu; Cole reaches the Monastery with the Finders and sets off on an adventure with Zane.

Cole, Zane and Bonzle travel to Mysterium, only to fall in Dorama's trap; Rontu sees potential in Sora and Riyu; Arin is frustrated.

Bonzle meets her creator Gandalaria; Kai becomes the third Dragon Master; the blood moon appears in the sky and the dragon masters are turned into statues.

Lloyd's visions lead the ninja to the Wyldness where they seek shelter in a mystical warehouse; Cole and Zane fight against the Administration and Agent Walker.

Cole, Zane and Gandalaria search for a release spell and obtain magical powers; the ninja rush to the Ritual of the Blood Moon to stop Lord Ras; Kai and Sora disguise themselves as Wolf Mask Warriors. 

With the sacrifices, spell and Blood Moon in his control, Lord Ras has everything he needs to unleash the Forbidden Five, unless the Ninja acts fast.

While searching for his parents, Arin and the Ninja rescue a baby dragon, uncovering a new mystery and mission for the team.

The Ninja reach the gateway to the Tournament of Sources only to discover they have not been invited; Kai and Bonzle evade the remaining Forbidden Five as they try to escape the Nether-Space.

After earning invitations to the Tournament of Sources, the Ninja attend a banquet for Elemental Masters with friendly faces and old enemies, and Lloyd confronts a familiar face from his vision.

Arin continues his investigation into the missing horns but makes time for Frak, who Sora suspects is working for Ras; Nya's first match pits her against Jay, still with no memory of their past.

In her match against Cinder, Wyldfyre's temper proves a liability in and out of the arena; in order to stay in the Tournament, the Ninja invoke an ancient rule that requires them to compete in a race outside of Temple City.

Arin grapples with Ras's accusation that Master Wu caused the Merge while the Ninja complete the Temple Race and win their way back into the Tournament.

Arin follows a lead in his investigation of the missing horns to the Temple City Museum; a tour from Roby reveals a deeper connection between the Tournament and Source Dragons.

Roby and Blekt visit an injured Lloyd to complete the transfer of Zeatrix's powers; Arin links Bleckt to a clue in his investigation and follows him back to a secret office, where Wyldfyre has an idea to uncover his plans.

As the final match approaches, the Wolf Mask warriors and Imperium forces join together — and begin mobilizing a powerful weapon against the Ninja.

Arin, Zane, and Cole make a shocking discovery in the Monastery of Gates as they defend the Dragon Horns; the depowered Elemental Masters clash with the Wolf Mask army.