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The Maze of the Red Dragon is the one hundred and thirty-sixth episode of Ninjago: Masters of Spinjitzu, and the eighth episode of season twelve.
Spoiler warning: Plot or ending details follow.
As the Ninja enter the Maze of the Red Dragon, Okino begins telling them about the hazards they can expect to encounter. Suddenly, the world around him freezes, and the sky is filled with the visage of Unagami, who confirms everything that Okino has so recently learned about his world. He then offers Okino the chance to join him in traveling to Ninjago, but only if Okino betrays the Ninja and allows them to be defeated. Okino hesitates at the thought of betraying his new friends, and Unagami takes the form of a fearsome dragon and threatens him before departing, allowing time to resume.
Shaken, Okino continues leading the Ninja into the maze, avoiding and dealing with dangerous traps until they come to the Red Dragon and the Keytana that it guards. The beast is awakened, and the Ninja are unable to harm it, with Unagami stopping time again as Okino is about to reveal its weak spot. He urges Okino to allow them to fall, but the samurai refuses and strikes the first blow against the dragon himself. Jay is ultimately able to gain the Keytana and finish off the dragon, and thus obtains an amulet that will allow him to summon the beast to his aid in a future battle. With their task accomplished, the Ninja head back to Terra Technica, while Okino heads off to find a new path for himself.