Spy for a Spy is the thirty-ninth episode of LEGO Ninjago: Masters of Spinjitzu.
The Ninja have created a secret alliance of elemental fighters, Cole has found Zane, and Nya goes undercover within Chen's kabuki to figure out the man's nefarious plot.
In Chen's factory, Cole works with Karlof and the recentely eliminated Camille on making fortune cookies. Surprised at seeing the Earth Ninja so happy all of a sudden, the Master of Metal questions him. Cole explains that now he's found Zane and is attempting to break out. He slips a note in one of the fortune cookies saying what his condition is to the Ninja and places it on a dish piled with fortune cookies for a banquet Chen is hosting. Despite a close call, the cookie makes it past the guards without any suspisions.
Meanwhile, Nya and Dareth are outside Chen's Palace. Nya attempts to go in, but is stopped by Dareth, who disguises her as one of Chen's kabuki so she can get in undetected.
As it turns out, the banquet is being held for the eight remaining competitors who have made it to the second round. Lloyd is suspicious at first, but Chen tells him to lighten up. He also congratulates Shadow for his impressive victory against Toxikita. The masters discuss their current standpoint, while Griffin Turner states he attempted to enlist Shadow, but he refused. As the fortune cookies are brought in, Chen demands to have them brought to him while Clouse reminds him of the competitors' wisphering, revealing they have a spy feeding them the alliance's information. As Chen decides to take action, he puts the fortune with Cole's message back. He rises and tells the remaining eight that he knows that they have a secret alliance and that the Tournament is about stealing everyone's powers. To crumble the alliance, Chen lies and tells that whoever wins gets his Staff of Elements. Lloyd, disgusted, reveals Neuro had read Clouse's mind, though he denies it after being glared at. This, combined with Griffin saying Lloyd just wants the staff for himself is enough to weaken the alliance. Jay state the ninja now need proof to fully convince everyone while being pestered by a kabuki, realizing it's Nya. After telling Jay she knows what happened between him and Cole, she tells the Ninja that she and Dareth undercover and that one person in their group must be a spy if Chen managed to find out about their plans. Skylor approaches and gives Kai the fortune, surprising everyone that Cole had managed to find Zane and making Kai glad to know he can trust her. Jay questions who the spy could be, while Lloyd becomes convinced it's Shadow and glares at him.
Back at the factory, Cole causes havoc and ends up in Zane's prison cell. Cole reveals that he stole the keys from the guard while fighting him. He frees Zane and and they escape. Unfortunately, the guard realizes that Cole has gone missing and raises the alarm. Nya gets to the spellbook and takes away page 149 of the book. Clouse enters his quarters as well and notices a white marking on the cover of the spellbook. Clouse's pet is released and chases Zane and Cole. Luckily, Zane and Cole escape by exploding shurikens. At the fighters's quarter, all the fighters show their backs to determine who the spy is. The one who has a snake tattoo on their back is a spy. The Ninja assume Shadow is the spy and he runs away. Meanwhile, Dareth blows his cover and is chased and caught by Chen's guards. Nya also blows her cover but escapes into the forest after a brief fight with Clouse.
In the throne room, Chen asks his spy if Nya was captured. It's revealed that the spy is Skylor, who hid her tattoo from the Ninja using Chamille's Form power. She informs him of Cole and Zane's escape and calls him father, to which they cackle at the thought of the Ninja being disbanded forever.
- Skylor is confirmed to be Chen's daughter, as well as the spy. It is also revealed that she absorbed Chamille's power.
- Toxikita is revealed to have been eliminated, having battled Shadow and lost.
- The episode title is a play on the phrase " an eye for an eye."
- This episode marks Shade, Kapau, Chope and Eyezor's first speaking roles.
- According to the Ninjago website, the skull on the table with
the spellbook actually belonged to the late king of the underworld, Samukai. Whether or not this is canon is debatable, however, considering that the skull isn't the same shape as Samukai's.
- The song Dareth dances and sings to is similar to Johnny B. Goode.
- Cars 2-When
Dareth blew his cover when trying to use the cloak button on the DB Express and was chased by the Cultists, it's similar to the scene in the movie when Mater blew his cover in the casino and was caught in a crossfire with Professor Z's armed henchmen.
- Paleman wasn't in Kai's room when everyone was checked for tattoos, yet was apparently implied to have been checked.