Kai and Nya time travel to the past, where they must help the Elemental Masters prevent the Hands of Time from changing Ninjago history.

Master Wu engages in a fight left unfinished decades ago against Acronix, one of the twin Hands of Time. The ninjas try to rescue him.

Kai discovers both of his parents are being held captive. Meanwhile, a third Time Blade appears.

The Hands of Time force Kai and Nya into retrieving the fourth Time Blade from the Boiling Sea.

While the rest of the ninjas try to find and rescue Master Wu, Nya confronts the Samurai X imposter and Kai seeks the truth about his parents.

Kai uses a Vermillion Warrior helmet to uncover information about Krux, while Lloyd struggles as a master-in-training and Nya tries to reboot Zane.

The ninjas learn more about fallen Elemental Masters, Krux and Acronix, and discover they have a new enemy.

The team enjoys a victory and retrieves the Emerald Time Blade, but the celebration is short-lived.

The ninjas fight to save an amusement park while Jay defends his family home from the Vermillion Warriors -- until the Emerald Time Blade arrives.

The Vermillion Warriors mysteriously steal items made of metal while Lloyd comes to realize that filling Master Wu's shoes is a daunting task.