15x1 - A Big Splash

April 4, 2021

The ninjas ambush a new villain named Miss Demeanor. Nya creates a water cyclone to stop her but loses control of it, threatening a nearby village.

15x2 - The Call of the Deep

April 4, 2021

Maya attempts to take charge of Nya's life to solve her problems. Zane and Pixal respond to a distress call at sea.

15x3 - Unsinkable

April 11, 2021

Nya, Jay, Zane, Pixal and Lloyd board a new submarine, the Hydro Bounty, and set off to find the source of the energy signal disrupting Nya's powers.

15x4 - Five Thousand Fathoms Down

April 11, 2021

Nya and Maya use underwater suits to travel to an ancient temple after they realize its power source is the only way to get the Hydro Bounty running.

15x5 - The Wrath of Kalmaar

April 18, 2021

Nya and Maya attempt to get out of a tough predicament. Meanwhile, Jay risks his life while trying to restore power to the Hydro Bounty.

15x6 - Long Live the King

April 18, 2021

After Nya and Maya's rescue, the ninjas are escorted to Merlopia to face King Trimaar. However, a betrayal turns the ninjas into fugitives.

15x7 - Escape from Merlopia

April 25, 2021

The ninjas survive the palace flooding — but are pursued by ripper sharks. Benthomaar comes to help and leads them to the hangar bay.

15x8 - The Tale of Benthomaar

April 25, 2021

A flashback tells the tale of Benthomaar, revealing how King Trimaar finds him as a baby and raises Benthomaar as his own.

15x9 - The Storm Amulet

May 2, 2021

The ninjas return to the island of the Keepers and ask their leader to keep an amulet safe in Ninjago City — but they make a surprising discovery.

15x11 - Papergirl

May 9, 2021

As Kalmaar and the ninjas wage a battle in Ninjago City, the storm amulet ends up in the possession of a determined paper girl.

15x12 - Master of the Sea

May 9, 2021

Benthomaar tells Nya the tale of Nyad. Meanwhile, Master Wu, Kai, Cole, Ray, and Misako try to keep Kalmaar from taking off with the storm amulet.

15x13 - The Calm Before the Storm

May 16, 2021

The doomsday serpent, Wojira, rises from the sea. In Ninjago City, Glutinous emerges from the water with a dire warning.

15x14 - Assault on Ninjago City

May 16, 2021

The ninjas leap into action after Kalmaar and Wojira arrive in Ninjago City, bringing a tsunami that floods the entire city.

15x15 - Nyad

May 23, 2021

Overpowered by Wojira, the ninjas retreat to the NGTV building to regroup. Nya might make a decision that she may never be able to come back from.

15x16 - The Turn of the Tide

May 23, 2021

Kalmaar's temper proves too much for Wojira to handle during battle while the ninjas try to help Nya fulfill her destiny.

15x17 - Episode 17

May 23, 2021

15x18 - Episode 18

May 23, 2021

15x19 - Episode 19

May 30, 2021

15x20 - Episode 20

June 6, 2021