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Would You Like to Enter Prime Empire? is the one hundred and twenty-ninth episode of Ninjago: Masters of Spinjitzu, and the first episode of season twelve.
Spoiler warning: Plot or ending details follow.
After a relatively peaceful day in Ninjago City, the Mechanic and his goons break into a warehouse containing various pieces of outdated technology. After some searching, they discover their target-a strange-looking motherboard-only to be confronted by the Ninja. The two groups briefly clash, the Ninja making use of the various old gadgets lying around. The Mechanic attempts to escape in a truck, but is stopped by the Ninja.
As the Mechanic is taken away by the commissioner, the Ninja investigate his hideout: an empty video arcade. Jay soon discovers a cause for excitement: a cabinet for the legendary Prime Empire, a video game created by Milton Dyer. As the other Ninja investigate the remainder of the building, Jay inserts the motherboard they confiscated into the cabinet. The other Ninja then discover a communication device, and are mistaken for the Mechanic by a mysterious being named Unagami.
Jay's playing unleashes a strange wave of energy that affects other game cabinets across the city. When Jay reaches Level 13, the cabinet opens to reveal a glowing doorway, through which Jay disappears. The other Ninja emerge only to find Jay gone, while all around the city other players are offered the opportunity to "enter Prime Empire"...