July 8th, 2015
The Ninja use Ronin's airship to travel to the tomb of the First Spinjitzu Master in an underwater cave under the ocean, only to find out Morro is already there - and the Ninja must traverse the temple traps without the aid of the Sword of Sanctuary in a desperate attempt to get to the tomb first.
While the Ninja travels through the ocean in R.E.X., Zane remarks that they're close to the Tomb of the First Spinjitzu Master. As Kai and Cole are worried about being underwater, Sensei Wu informs his pupils via video screen that he, Misako, and Nya are headed to their location on the Bounty, and that it'll be up to them to find the Realm Crystal before Morro, who is already ahead of them. After Misako tells them a riddle that might help them past the three tests, the Ninja are pursued by the Leviathan, which they manage to trap and escape successfully, while at the same time Morro is using the Sword of Sanctuary to foresee a trap in the tomb.
Soon, the Ninja arrives at their destination, and almost immediately as they step foot on land Jay stumbles upon a piece of cloth that belonged to Morro, saying all the hopes that he wouldn't find it are gone. While Kai remains optimistic about their position, Zane finds a statue of the First Spinjitzu Master, and Cole's awestruck words accidentally trigger R.E.X.'s auto-return, leaving the Ninja behind with no Aeroblades and no way out of the underwater tomb. Despite these odds, the team ventures forward to face the tomb's tests.
Meanwhile on the surface, the Bounty has reached their location and awaits their return—even upon discovering Morro's minions are also there doing the same. Despite Nya's anxiety at their presence, Wu advises to simply be on alert and not provoke any attacks. While they're waiting, Wu questions Nya about her training, to which she absent-mindlessly answers her slow progress. This concerns Wu since her indifference is coming from her interactions with Ronin, but Misako reminds him that Nya has always been pressuring herself to her own set limits.
The Ninja arrive in the first of the tomb's challenges: a circular room with sixteen doors, each with symbols on and above them. They quickly realize the procedure: choose the right door to proceed, or "end up in a realm of hurt" as Cole puts it. Jay notes the symbols around them as Kai questions the first part of Misako's clue for the tomb, leading him to one symbol that resembles a Spinjitzu tornado. As Jay heads for that door, Zane stops him in alarm as P.I.X.A.L. analyzes the symbols. Seeing a pattern, Zane explains the pattern: the whole room is a zoetrope, in which the symbols on the doors are slightly different from the previous and thus create a moving image when in motion. Therefore, he does what "a Spinjitzu master can" - Spinjitzu - and the motion creates one of the symbols that is apparently above the door they came in from. His choice proves to be the right one, as they find themselves in another underground hall to proceed.
This time, the second room is a dead end, devoid of man-made structures except for on the other side: the Golden Staff of the First Spinjitzu Master. Sensing its implication, the Ninja become wary of the room's security and turn to Zane to sense any patterns or dangers; but neither he nor P.I.X.A.L. can find any. Jay then points out the second part of the clue, what a Spinjitzu master "cannot"—which they find out once a step forward from Kai sets off well-hidden stone darts in their direction. Now with a better idea on the test's difficulty, Kai comes up with the idea of using Airjitzu instead of Spinjitzu to reach the staff, but the technique's temporary use stops him short and starts a long series of traps that corner and surround the others. Even so, the Fire Ninja remains undeterred in reaching the staff until Cole points out something crucial about the clue: since a ninja never gives up, it would make sense to use the staff to draw them away from their true objective. He then takes a literal leap of faith toward their only way out at that point - the chasm trap they made - and tells them to do the same, which Kai grudgingly does as well. Their fall sends them through a roller coaster of ice-crystal slides into an enormous maze, the third and final test.
As Jay leads them due to his claim at being excellent with mazes, Kai and Zane see something extraordinary within a particular crystal wall: their reflections are much older and wearing the attire of a sensei. Although Kai becomes pessimistic about its implication, Zane clears it by explaining their reflections are actually images of their future selves, which Jay confirms when he notes he will have facial hair, an eyepatch, and be with Nya again, much to his elation: he keeps the last one to himself. Cole notes this could be connected to the clue's third part to not "look ahead," but discovers he cannot see his own reflection even when beside Kai and Zane in the same crystal. Looking hard to find something of himself, he finally sees something - which happens to be Morro, who ambushes the Ninja while also traversing the maze. As they scramble to rejoin, Morro repeatedly attacks them with the Sword of Sanctuary, leaving them only with sliced crystal shards to counter his moves. After a while of back-and-forth attacks, Kai finally notices that as Morro breaks more shards, several more instantly take their place, providing him the successful idea of baiting the Master of Wind into trapping himself. Leaving the immobilized Morro behind, the Ninja proceed more confidently until Jay solves the third test; they should not look forward or ahead, but down where tombs usually are found, and one area shows cracks where light is escaping.
The foursome, after digging tirelessly, find themselves in one final cavern. This one is different from the others, as it contains an essence of every single element existing in Ninjago, as well as the tomb holding the remains of the First Spinjitzu Master himself. The Ninja kneel in respect for Ninjago's ultimate creator, and then Zane carefully extracts from his remains the object of their mission: the Realm Crystal. Upon its recovery, Morro shows up again demanding the Realm Crystal while holding a semi-conscious Lloyd at blade-point. Seeing how the odds are at a standoff, if not in Morro's favor, Cole vents his frustration which triggers the earth below him to rumble. Kai realizes their powers are returning now that Morro is no longer possessing Lloyd, albeit slowly, and comes up with a plan to even the odds. He converses with Morro before throwing him the crystal, prompting the Master of Wind to catch it while dropping Lloyd - and then drop it accidentally into a nearby stream due to the bottom being heated by Kai's weakened fire power. Enraged, he blows Lloyd into the stream as well, which carries both him and the crystal toward a nearby waterfall. Despite their fears of the water, Kai and Cole manage to rescue Lloyd from drowning, but not the Realm Crystal as Morro uses his Wind power to stop its fall while keeping Jay and Zane at bay. With the relic in hand, he escapes, leaving the Ninja reunited with their friend.
Upon leaving the tomb, they find the Bounty also under attack with Nya struggling to keep up the wall of water that is protecting them from Soul Archer and Bansha's attacks. They soon have a reprieve when the ghosts crash their own boat from being distracted with their attack, but Morro then appears and the trio escape through a portal made by the Realm Crystal. As Wu, Nya, and Misako rejoice over Lloyd's recovery, Lloyd laments his inability to do more to stop Morro from succeeding, but Kai reminds him of his promise to watch over him as well as having him back on their side. The other Ninja back him up by showing their restored Elemental powers, declaring that even though Morro has his means of bringing the Preeminent to Ninjago, he has yet to see all of the Ninja at full strength.
- Zane - Brent Miller
- Kai - Vincent Tong
- Jay - Michael Adamthwaite
- Cole -Kirby Morrow
- Lloyd - Jillian Michaels
- P.I.X.A.L. - Jennifer Hayward
- Sensei Wu - Paul Dobson
- Misako - Kathleen Barr
- Morro- Andrew Francis
- Bansha - Kathleen Barr
- Soul Archer - Brian Dobson
- Nya - Kelly Metzger
- At the start of the episode, Zane is co-piloting R.E.X., but after the Leviathan's eye opens Jay is co-piloting. Then later when R.E.X. ascends into the tomb, Zane is back to co-piloting.
- How Bansha was able to control Misako is unknown, since Nya had a wall of water up. It is possible, though, her control could be psychic through her incantations and thus does not require possession.
- When Jay is being chased by Morro, his Aeroblade is shown, although the Ninja never brought them along because R.E.X. left the second the Ninja realized that they didn't have their Aeroblades.
- When Bansha possessed Misako, she had a green tint in her eyes, however, it disappears right before Nya sprays water on her.
- This is the first episode to feature the Leviathan since episode twenty-two, The Last Voyage.
- This is the episode where Lloyd is finally reunited with his fellow Ninja and ready to help them battle the ghosts.
- This also marks the end of Lloyd's possession by Morro.
- At the beginning of the episode, when the Ninja are journeying underwater in R.E.X., Chen's theme from the previous season is heard (the track featured is Meet the Elemental Masters).
- The symbol the door's figure creates upon doing Spinjitzu is the yin-yang symbol—the same symbol which is seen in "The Stone Army" during an aerial shot of Ninjago and the Dark Island. Fittingly, it represents the balance of light and dark, as well as personal balance.
- When the Ninja are looking at their "future" selves, Kai, Jay, and Zane see what they will look like, but when Cole looks, he cannot see anything, alluding a probable horrible fate. The reason for him not seeing anything might be that since Cole was already "dead," his age was frozen and so he may remain physically the same.
- However, according to "Infamous," the reason why Cole couldn't see himself was because in that episode, he had unlocked the ability to turn himself invisible.
- When Morro fought Jay in the First Spinjitzu Master's tomb, he cornered Jay and was about to slice with the Sword of Sanctuary when Zane used his ice powers to freeze the blade. With the Sword of Sanctuary in hand, Morro could have easily seen Zane, but didn't. This could have been because he was apart from Lloyd.
- For the first time, Kai succeeds in defeating Morro without interruption or help: he was "rescued" the first time while trying to draw Lloyd out, Morro trapped him in strangle weed the second time while in pursuit of the scroll of Airjitzu, and Lloyd aided him by taking over and handed the Sword of Sanctuary the third time. This victory could also be considered more monumental as Kai used his mind to trick and beat Morro instead of physical attacks like before.
- The cavern which contains the First Spinjitzu Master's tomb also contains a bit of every single element seen in Ninjago so far. However, the crystals on the rocky walls beg the question whether there was—or is—an Elemental Master to be represented there.
- The First Spinjitzu Master makes his first true debut in the television series after numerous mentions and flashbacks.
- This marks the second time Kai had two choices to make; save Lloyd from drowning or get the Realm Crystal, first being in "The Green Ninja," when Kai had to save Lloyd from sinking in lava or getting the Fangblade.