Echo Zane

Echo Zane is a Nindroid built using Zane's blueprint. He looks a lot like Zane, except rustier and instead of Zane's core he has a wind-up power source. He seems to be less intelligent than Zane, because he was unable to notice the difference when Julien's robo-butler cheated at chess.

The Last Resort
Jay and Nya discover Echo Zane in the basement of Julien's tower prison after they caught him spying on them. When preparing for the Sky Pirate attack, Nya and Jay repaired Echo Zane, removing most of the rust.

When facing the Sky Pirates, Echo Zane came to Jay and Nya's rescue and successfully fended off their attackers. Ironically, he ended up falling apart once Nadakhan showed up.

Note

 * Nya said that Dr. Julien built Echo Zane at the tower to replace the original. Since they have the same father, this would make Zane and Echo Zane brothers. This would also make them related with Juggernaut, the Falcon, and the robo-butler.
 * It is unknown why he bears a strong resemblance to Zane's Titanium Ninja form, since Dr. Julien passed away long before Zane assumed the role. This could be due to the Tinkerer's limited supplies and materials to build him, as was not the case with Zane, and also the fact that Echo Zane does not have much shell coverings.
 * Despite his decrepit state, Echo Zane does have some ninja-like abilities programmed into him. One prominent ability is scaling up and staying on walls and ceilings.
 * Since his debut, Ninjago's Nindroid faction now has four eye-colors: the Overlord version is red; Echo Zane is yellow; P.I.X.A.L. is green; and the original Zane is blue.