Season 10: March of the Oni

Season 10 of LEGO Ninjago: Masters of Spinjitzu, subtitled March of the Oni, was preceded by Season 9 and Tales from the Monastery of Spinjitzu, and succeeded by Season 11. It continues and concludes the story arc that began in Season 8. Cole is the intro character, but there is no mascot, nor is there a focus character. The Omega serves as the main antagonist. The Oni serve as this season's villainous faction.

Bragi Schut, who previously worked on both Sons of Garmadon and Hunted, is the lead writer. The Hageman Brothers are involved with the creation of the story but are not the script writers. While being only four episodes, it has also alternatively been edited into a feature-length TV film, spanning 88 minutes (one hour and 28 minutes).

The first teaser was released on December 16, 2018. The first trailer was released on YouTube on January 4, 2019. It was made available on the US Cartoon Network app and On Demand on April 12, 2019. The season premiered as a film in the United States on April 19, 2019.

Official Description
Teaser: ''Bringers of doom, darkness, and destruction descend upon NINJAGO, and all hope seems lost. The ninjas must fight off the Oni invasion – but how can they defeat this destructive power and protect the NINJAGO legacy? There isn’t much time left - is this the end of NINJAGO, or will good defeat the powers of evil?''

Trailer 1: ''The Oni are coming … As a demonic darkness descends upon the realm of NINJAGO, the time has come for our heroes to rise again and protect the land that all Masters of Spinjitzu call home. It is a world filled with a rich history and legacy, and it is from here where our ninja heroes must unlock an even greater power to defeat the darkness that is marching towards them. What could these shapeshifting dark forces be, why do they want to destroy NINJAGO, and how can they be defeated?''

We Are Ninjago: ''This is our history – and we’re going to fight for it! After years of training in the ancient arts to become Masters of Spinjitzu, after growing as both warriors and family, after protecting the realm from enemy after enemy, the ninja pitch an heroic last-ditch effort against the Bringers of Doom. They are fighting for the NINJAGO world and its rich history, and they are fighting for their legacy – and they will give it their everything. Why? Because they are Powerful. They are Family. They are Ninja!!!''

Cast

 * Cole - Kirby Morrow
 * Cyrus Borg - Lee Tockar
 * Dareth - Alan Marriott
 * Faith - Kathleen Barr
 * Garmadon - Mark Oliver
 * Jay - Michael Adamthwaite
 * Kai - Vincent Tong
 * Lloyd Garmadon - Sam Vincent
 * Misako - Kathleen Barr
 * Nya - Kelly Metzger
 * The Omega - Zach Leblanc
 * P.I.X.A.L. - Jennifer Hayward
 * Vinny - Vincent Tong
 * Wu - Paul Dobson
 * Zane - Brent Miller

Set
This season does not have its own coinciding wave of sets, but it is closely connected to Ninjago: Legacy, and uses elements of it. The sole set released under the Legacy banner.
 * 853866 Accessory Set 2019 (LEGO Store exclusive)

Focus Characters

 * There is no true focus character in this season.
 * Lloyd plays a large role in this season. His adventures with Garmadon in the darkness are key to the story, as well as their fight with Omega. In addition, Lloyd nearly dies in Episode 98 and meets his grandfather.
 * Garmadon plays a large role in this season. His mission with Lloyd to destroy the Realm Crystal is crucial to the season's plot. He also struggles with his emotions, and contemplates the meaning of life in Episode 97. His development builds up to him reluctantly helping the Ninja form the Tornado of Creation.
 * Cole also plays a role in this season. He narrates the intro and reads the episode title. His fall impacted the other Ninja, caused Nya to blame herself, and motivated Garmadon to learn there was more to life than survival, causing him to ultimately join the Ninjas' Tornado of Creation.
 * Jay, Nya, and Kai play somewhat significant roles in the season. Jay struggles with asking Nya to be his Yang, while Kai's reforging of the Golden Weapons is key to their fight against the Oni. In addition, Nya's struggle with her emotions after being responsible for Cole's fall is featured throughout Episode 97.
 * P.I.X.A.L. plays a smaller role. Her struggle to venture into the darkness to rescue Lloyd and Garmadon in time is emphasized throughout Episode 97.
 * Zane plays a small role in this season, having less to do than the other five ninja. He must let go of Pixal in Episode 97 to help save the people of NGTV News.
 * Wu has a smaller role in this season. He helps the ninja battle the Oni and perform the Tornado of Creation.
 * Misako had a cameo in Episode 95 and had an appearance in Episode 98 helping protect the people and monks.
 * Dareth appears in Episodes 95 and 98.
 * Cyrus Borg appears in Episodes 95, 96, and 98.
 * Skylor, Ronin, and Karlof make cameos in Episode 98.
 * Faith makes a cameo in Episode 95, and returns in Episode 98 to help the ninja.

Antagonists

 * The Omega is the main antagonist of this season.
 * The Oni are the villainous faction of the season.