Zane Julien is the current Elemental Master and Ninja of Ice, P.I.X.A.L.'s boyfriend, as well as the first Nindroid in Ninjago. Zane was recruited by Master Wu, and learned Spinjitzu and discovered his other teammates, with whom he embarked on many adventures; battling the likes of the Serpentine and the Stone Army. During this time, Zane was reunited with his inventor/father figure, Dr. Julien, but sometime after the Final Battle, Dr. Julien passed away again.
After Lloyd won the Final Battle, Pythor aided the Overlord in becoming the Golden Master and commanding an army of Nindroids that were made from Zane's blueprints. During this time, Zane grew closer to another droid, P.I.X.A.L., and battled a Nindroid named Cryptor. The ninja clashed with the Nindroids until Zane sacrificed himself to defeat the Golden Master.
After building himself a new body and before he could go back to his friends, Zane was captured by Chen, and sent to a mysterious island. The ninja eventually found Zane in his new titanium body, (with Cole being the first) and rescued him. They then allied with the Elemental Masters to defeat the Anacondrai Cultists. With Zane back in the action, the ninja went on to battle Morro and an army of ghosts. After Nya destroyed the Cursed Realm, the ninja fought Nadakhan, who rebuilt his home realm in Ninjago, though this was undone by Jay's final wish. On the Day of the Departed, Cole accidentally revived Cryptor (and many other deceased villains), who Zane fought and destroyed once more. When the Time Twins and Vermillion warriors fought the ninja, Zane helped the ninja defeat their adversaries, but lost contact with P.I.X.A.L. in the chaos.
Zane later helped the ninja battle the Sons of Garmadon and started a rivalry with the elusive Nindroid, Mr. E. During the conflict, Zane discovered that P.I.X.A.L. is the new Samurai X. Together, they attempted to stop the resurrection of Lord Garmadon but ultimately failed to do so. After Garmadon conquered Ninjago, Zane was marooned in the Realm of Oni and Dragons with the original ninja and a growing Wu. They were also forced to deal with the threat of the Dragon Hunters as he, Jay, and Kai are captured and exploited for their Elemental Powers. The trio escaped with Cole and Wu, and he helped the aging Wu regain his confidence and memories. Eventually, Wu claimed the Dragon Armor and the team returns to Ninjago, where Zane reunited with his other friends in an invaded Ninjago City and defeated Garmadon's Colossus, restoring peace to Ninjago.
When the Oni finally invaded, Zane and the rest of the ninja fought to defend their home. Zane, the rest of the ninja, Wu, and Garmadon used the Tornado of Creation to defeat the Oni.
Several months later, Zane began having dreams foreshadowing an invasion of Pyro Vipers and Blizzard Samurai. The ninja accidentally released Aspheera and the Pyro Vipers shortly afterward. Zane helped the ninja fight the Pyro Vipers siege at the Monastery where he used Forbidden Spinjitzu to defeat Aspheera, only to be banished to the distant past of the Never-Realm alongside the second Scroll of Forbidden Spinjitzu. He was stranded in the unfamiliar realm, where he fell under the sway of the manipulative Vex, who erased his memories. Due to Vex's manipulation, Zane overthrew Grimfax's throne and became the Ice Emperor, with Vex as his right-hand man, Grimfax joining them, and the Scroll corrupting his ice powers. Due to Zane being sent around 60 years into the past, he and his Blizzard Samurai ruled over the Never-Realm for long decades. His identity would finally be uncovered by Lloyd when the ninja arrived to rescue him, and Zane was able to regain his memories and return the Never-Realm to normal. After the Never-Realm was restored to its original state, Zane returned to Ninjago with his friends.
When citizens started vanishing in large numbers and entering Prime Empire, Zane stayed behind to prevent his memory and code from being overwritten. While in Ninjago, he began a search for Milton Dyer and eventually helped discover the secret behind Prime Empire and Unagami. Zane was used as a power source by the Mechanic to fuel the Manifestation Gate. Zane eventually escaped and fought off Unagami's invasion. Zane and P.I.X.A.L. reunited with the rest of the ninja after Jay and Dyer successfully convinced Unagami to release the formerly trapped gamers and ninja.
Zane later traveled to the Kingdom of Shintaro on top of Shintaro Mountain. When he discovers Cole was captured by the evil Skull Sorcerer, he travels underground and helps save him. Zane and Kai later get captured by the Geckles and tames a creature known as a Mino. Zane and Kai try to unite the Geckles and the Munce but end up being captured along with Jay, Nya, and Lloyd. The Skull Sorcerer sentences them to death, but they are saved by Plundar, a member of the Upply, under Cole's command. Zane helps the other ninja fight against the Re-Awakened and they eventually succeed. Zane, Wu, and the other ninja leave Shintaro, but prepare to go on another adventure.
Zane traveled to the Island of the Keepers to save Misako and Wu. He ended up being captured by the Keepers. There, the ninja discovered the Storm Amulet and the existence of Wojira. He realizes that the Keepers were being tricked into giving away sacrifices to a fake Wojira, and helped stopped the Kryptarium inmates who were behind it.
Later, he would explore the sea with Maya, Nya, Lloyd, P.I.X.A.L., Jay, and Benthomaar to stop Kalmaar from awakening the evil serpent, Wojira. Unfortunately, the serpent was awakened and attacked Ninjago. Zane saved as many people as possible but Wojira proved to be too powerful. Ultimately, Nya had to sacrifice herself to defeat her. Afterwards, he attended a memorial to honor Nya.
A year after Nya's departure, Zane turned off his emotion meter to avoid grief before learning from Nya that the only way to return her to normal is to remove her Elemental Power. Zane, along with Kai and Lloyd, eventually break Aspheera out of Kryptarium, steal her staff from the New Ninja, and return Nya back to normal before being arrested by them and sent to Kryptarium, where they learn of the Crystal King. After Nya and Dareth break them out, Zane (along with Kai and Dareth) meet an amateur singer named Sally, who ran away from home. Seeing her become emotional at missing her parents, Zane managed to regain his emotions before taking her home.
Several weeks after the Overlord's defeat, Zane decided to search through his memory archive in order to try and recover his powers before coming face to face with his Ice Emperor self, where he forgives him and regains his powers in the process.
After the Merge occurred, Zane ended up in the Monastery of Imperium, where he remained on standby in a stasis pod, until he was discovered by Kai and Nya years later, before raising the monastery to assist Lloyd, Arin, Sora, Riyu, and Wyldfyre in escaping Imperium. While the rest of the Ninja went off to search for the three Dragon Cores that can help stabilize the Merged Realms, Zane remained behind to try and reactivate the portal gate to Imperium, only to be detained by two agents from the Administration, until Lloyd and Arin inadvertently came to his rescue while searching for the core they were assigned to, eventually reclaiming it, completely unaware that Jay was in the Administration. Zane then joined the other Ninja as they infiltrate Imperium, meet up with the Resistance, and expose Beatrix for her deception, who creates a MergeQuake Storm in retaliation, until she was sent into a rift by Arin before heading to the Crossroads, where Lloyd used all three Dragon Cores to stabilize the Merged Realms.
One year following the Liberation of Imperium, news spread about Ras' occupation of the Cloud Kingdom, prompting Zane and the ninja embark on a mission to put an end to Ras' rule. However, their attempt was thwarted as Cinder, using Shatterspin, easily defeated the entire group of ninja, forcing them to retreat. Upon encountering Cole and the Finders, Zane, Cole, and Bonzle set off to Mysterium in search of Gandalaria. Despite an interference from Dorama, they finally manage to locate the sorceress and ask for her help to protect Bonzle from Ras' clutches. Following a successful showdown with Administration Agents, who sought to eliminate Zane, the group eventually find the Magical storagehouse but in vain as Jordana managed to kidnap Bonzle and trap the others. In their search for Bonzle, Zane, Cole, and Gandalaria saved the Cloud Kingdom and the Cloud Monks from obliteration. When the Matriarch of the Mountain Dragons was killed, Zane participates in the Tournament of the Sources alongside the other ninja to discover the matriarch's killers. However, he loses his first match and his element to Zur due to the challenge being rigged, but tells his teammates a lesson about fighting fairly. Near the end of the tournament, he goes with Arin and Cole to the Monastery of Gates, while processing the information from Arin that Wu orchestrated the Merge. The ninja end up fighting Nokt and Rox but the former eventually succeeds in freeing the rest of the Five. After Nokt's defeat and the return of elemental powers to their respective wielders, the Forbidden Five escape through a portal and destroy it, with Arin following them to save Ras. Shortly after, Zane realizes they are all scattered in the Merged Realms.
Weeks later, the ninja split into two groups, with Nya, Kai and Wyldfyre searching for Jay and Zane, Lloyd, Sora, Frak and Zanth tracking Arin. Zane and his group eventually stumble upon a Prismatic Blade that they decide to keep. Later, Zane separates himself from the rest while taking Zanth with him and he discovers the First Land Monastery and confronts the Freebooters. After getting into a train, he ends up releasing P.I.X.A.L from her stasis pod, which the Freebooters stole. The couple find themselves fighting Nokt and a horde of Dragonian Warriors over the possession of another Prismatic Blade. Nokt ultimately succeeds and sets the train off course, forcing Zane to stop the train, resulting in him taking serious damage. After P.I.X.A.L. built him a new body, he, P.I.X.A.L., and Zanth reunite with Lloyd and the rest of the group. Upon learning the Forbidden Five's true aim to release Thunderfang, the ninja reunite in an attempt to stop them. The search for the last Prismatic Blade leads them to reunite with Arin, who reveals his parents' deaths and rejoins them in stopping the Five to save Ras. However, the Five succeed in releasing Thunderfang and the ninja engage him. The Shatter Dragon was eventually killed by Arin, who returns to Ras with Sora while Zane returns to the monastery with the other ninja and Jay, who discloses that Arin's parents are still alive.
Following Egalt's funeral, Zane and P.I.X.A.L. wishes to travel the Merged Lands together so the latter can see what she's missing. After the Source Dragons of Life, Strength, and Focus withdrew from the council, Zane is presumably affected by the imbalance and is likely unaware that his friends are scattered throughout the Merged Lands.
