The Mechanic's warehouse is a warehouse in Ninjago City.
The Mechanic shows a captured Zane his new hideout as well as a new invention called the Manifestation Gate. He then demands for the Prime Empire motherboard, but Zane claims they destroyed it. Knowing he lying, the Mechanic brings in Wu, who was captured earlier, and threatens to hurt Wu by his robo-arm if Zane doesn't give him the motherboard. Zane ends up confessing and hands the Mechanic the motherboard.
Meanwhile, P.I.X.A.L. and Milton Dyer are able to sneak in after Wu sent his location to them. As Zane is getting hooked up to the machine to operate the gateway, P.I.X.A.L. gains the attention of the Mechanic and his henchmen fight P.I.X.A.L. However, it's too late as the Manifestation Gate is opened and the Mechanic stands waiting for Unagami to arrive.
The Mechanic himself and a couple of his henchmen flee the warehouse, fearing the arrival of Unagami. Inside the warehouse, P.I.X.A.L. fights a couple of henchmen still left while Milton Dyer unties Wu. While P.I.X.A.L. is trying to free Zane, Jay arrives from Prime Empire and helps P.I.X.AL. remove Zane from the Manifestation Gate. After they were able to save Zane, Jay lays out the plan to stop Unagami and everyone head out.
After Unagami decides to live a new life along with Milton Dyer, everyone trapped from the game as well as a couple of NPCs walk out of the warehouse, while the Red Visors and Whack Rats went to the Mechanic's Warehouse to return to Prime Empire.
- It is unknown whether the warehouse belongs to the Mechanic or was just abandoned and the Mechanic appropriated it.