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The Speedway Five-Billion is the one hundred and thirty-ninth episode of Ninjago: Masters of Spinjitzu, and the eleventh episode of season twelve.
Spoiler warning: Plot or ending details follow.
As Racer Seven is welcomed into Scott's garage, one of the Red Visors spots her and calls for reinforcements. The Ninja and Scott explain their plans, only for the garage to come under attack. Scott, determined to make the most of his last life, attacks the Red Visors while Seven and the Ninja escape. After turning Scott into an energy cube, the Red Visors enter vehicles of their own to pursue the Ninja. Both groups soon find themselves on the speedway track, along with several other teams.
Cole manages to secure a car from a member of the Brotherhood of Rats, and Kai's vehicle transforms into a mech after he obtains a loot box. However, realizing that the Red Visors must be stopped, the two Ninja sacrifice themselves in order to allow the others to continue the race. Seven overcomes her programming and crosses the finish line, winning the Keytana, which she promptly turns over to the remaining Ninja. When the Red Visors question her about their whereabouts, she informs them that Unagami has no need to find the Ninja...because they're coming to him.