Grave Danger

"Grave Danger" is the eighth episode in the fifth season of Ninjago: Masters of Spinjitzu, and the 52nd episode of the series as a whole.
==Plot==
While the Ninja travels through the sea 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, Master Wu informs his pupils 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. Meanwhile, Morro is using the Sword of Sanctuary to make his way through the tomb.
Soon, the Ninja arrive at their destination, and almost immediately as they step foot on land, Jay finds 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 notices a statue of the First Spinjitzu Master, and the Ninja stand in awe. As they had reached their destination, R.E.X.'s auto-return function activated, leaving the Ninja behind with no Aeroblades, and no way out of the 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 put 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 that 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 figures out—"a Spinjitzu master can" do Spinjitzu. 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 hallway to proceed through.
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, 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 Flame Heat Warmth Burn Burning and Hot 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 master. 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; although 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 and Air 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 Four Ninja, 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.
== Appearances ==
=== Minifigures ===
* Bansha
* Cole
* Evil Green Ninja
* 
* First Spinjitzu Master 
* Ghoultar
* Jay Walker
* Kai
* Lloyd Garmadon
* Misako
* Morro
* Nya
* P.I.X.A.L. 
* Ronin 
* Sensei Wu
* Soul Archer
* Zane
=== Vehicles ===
* Destiny's Bounty
* R.E.X.