Techno Strike! is a LEGO Ninjago: Masters of Spinjitzu book that was released in 2014. It takes place within the plot of Season 3: Rebooted, during the events of the episode "The Art of the Silent Fist."
LEGO® Ninjago: Rebooted! The beloved, wise-cracking ninja are back with all-new adventures.
Cole, Jay, Kai, Lloyd, and Zane are five ninja on the run. The Masters of Spinjitzu have escaped the Overlord and his henchman, Cyrus Borg. But now Sensei Wu is the Overlord's captive, and the ninja are desperate to get him back.
There's only one way to stop the Overlord, and that's to wipe out his power at the source - a system reboot. But the Overlord's minions, the Nindroids, are everywhere, and they are just as skilled as the ninja. It's man vs. machine - ninja vs. Nindroid! Who will win?