The Nindroid Army is a force of combative Nindroids based on the design of an intelligent scientist dubbed as Dr. Julien, who constructed the first Nindroid named Zane. Not long after Dr. Julien's death, Cyrus Borg built Borg Industries at the location where the Golden Ninja defeated the Overlord; little did he know, that the Overlord had become a digital version of himself, corrupting Cyrus' assistant, an android named P.I.X.A.L., plotting to scan Zane to create an army of enhanced Nindroids.
The first known Nindroid was Zane, who was built-in Dr. Julien's hidden workshop. Initially a blank slate, Zane learned new skills from his creator, who gradually came to see the Nindroid as a surrogate son. Before passing away of old age, Dr. Julien deactivated Zane's "Memory Switch" to spare him the pain of losing a loved one, causing Zane to believe himself to be an orphan. Eventually, Zane discovered his true heritage and reactivated his Memory Switch, coming to terms with his past and unlocking his True Potential.
An army of Nindroids act as the Overlord's new army during the Nindroid crisis. These Nindroids are created at Borg Tower to take over Ninjago City, led by General Cryptor. They were created by P.I.X.A.L. after she scanned Zane's blueprints and was controlled by the Digital Overlord.
While some were presumably reprogrammed by Cyrus Borg and placed in Hiroshi's Labyrinth at one point, there are still a few operational Nindroids hard-coded to serve the Overlord. Some are imprisoned within Kryptarium Prison. Cyrus later built a group of white Nindroid Sentries to guard Hiroshi's Labyrinth Stronghold, a new generation of Nindroids.
- General Cryptor (leader)
General Cryptor was one of the many Nindroids designed by the Overlord and served as their commander. Cryptor found himself at odds with the original Nindroid, Zane, whose design inspired his. Cryptor and his allies fought to stop the ninja from erasing the Digital Overlord from the Digiverse. Despite failing to do so, Cryptor and the Nindroids claimed the Golden Weapons, which allowed for the birth of the Golden Master. During his assault on the city, Cryptor fought against Nya and was frozen when Zane sacrificed himself to defeat the Golden Master. Subsequently, Cryptor was destroyed after shattering apart.
Nindroid Warriors are advanced combat robots created by P.I.X.A.L. under the Digital Overlord's influence and form the heart of the evil Nindroid Army. They have a similar colour scheme to P.I.X.A.L.
The Nindroid Drones are the basic foot soldiers in the Digital Overlord's Nindroid Army. They do not appear in the TV series, though they appear in the comic, Who is the Phantom Ninja?. They use the same torso design as Min-Droid and otherwise have the appearance of Nindroid Warriors without masks.
Min-Droid was a member of the Nindroid Army created in Borg Industries. He is a Nindroid Warrior that was indirectly created shorter than the other Nindroids as a result of not enough metal, leading General Cryptor to give him the nickname "Min-Droid."
- The word "Nindroid" is a portmanteau word composed of "ninja" and "android." The term was first mentioned by Jay in "Tick Tock" to describe Zane following the revelation of his robotic nature.
- The Nindroids are the first antagonistic group that Garmadon had no affiliation with.
- However, Garmadon disguised himself as one of them in "Enter the Digiverse."
- It is also the first antagonistic group which Wu had an affiliation with.
- In their Legacy minifigure variants, they have two face prints, the back print being the same but the eyes switching places.
- The Nindroids are the second villainous faction to have members named by their ranks other than an actual name, the first being the Stone Army.
- The Nindroids were featured as enemies in the non-canon game, LEGO Ninjago: Shadow of Ronin.
- According to Tommy Andreasen, the Nindroids would have stronger Spinjitzu than the Skulkin would if they could do Spinjitzu.
- It would seem that, unlike Zane, these Nindroids' consciousnesses would not find new hosts upon destruction of their bodies.
- "The Invitation"
- "Tick Tock"
- "The Surge"
- "The Greatest Fear of All"
- "Public Enemy Number One"
- "The Darkness Comes"
- "Never Trust a Human"