- Novelty within LEGO® fiction
- Stories based on research with young readers who want to know what Master Wu and Lord Garmadon were like as young ninja
- The series delves deep into the LEGO® Ninjago® universe with background stories and also exclusive never-before-seen content from new heroes and villains to brand-new lore
- Easter eggs for fans
- LEGO NINJAGO remains one of the most popular LEGO brands
- 2021 is the 10th anniversary of LEGO NINJAGO with a gold-themed year-long campaign
- LEGO NINJAGO franchise tie-ins planned from 2022 onwards
The Curse of the Cat-Eye Jewel
- Main article: The Curse of the Cat-Eye Jewel
The Lair of Tanabrax
- Main article: The Lair of Tanabrax
Days later, Wu and Garmadon continued to head to the northern ocean until they stopped by at a village. But the brothers soon learned from Hana and Obachan that for the past few weeks, the villagers have been mysteriously disappearing.
Garmadon trained the villagers on how to fight the puppets until they were all ready. Once they were, they headed off to the woods to confront Tanabrax and the puppet army. Garmadon, Hana, and Moody went on ahead until they ran into Bunch and Puppet Wu. After trapping Puppet Wu in a chest, Garmadon soon found Wu's unconscious body, along with the villagers that were kidnapped by Tanabrax.
Garmadon demanded Tanabrax to change all the victims back to normal, but the puppet master refused. He fought Tanabrax for the medallion, but had difficulty of fighting him due to Tanabrax's status as a shadow. But by using a mirror, Garmadon distracted Tanabrax long enough to steal his medallion. Moments later, Obachan and Moody arrived and opened a hatched, exposing Tanabrax to the Sun and killing him. After Tanabrax was defeated, Garmadon was able to use the medallion to free all the souls of the victims and placed them back to their original body, but at the cost of Bunch and Moody being dissolved into dust, as they both lost their human bodies long ago.
After the villagers returned to their homes, Obachan instructed them to prepare a feast for a celebration, while Hana thanked Wu and Garmadon for rescuing her brother, Shin. To prevent the medallion from ever be used again, Obachan buried it underground. Wu and Garmadon then decided to have some of Mrs. Uchida's dumplings before continuing on their journey tomorrow.
- Wu's appearance on the covers resembles his appearance in Hunted, while Garmadon's appearance resembles his young movie design that was seen in concept art.
- Wu uses his hair piece from Hunted and wears a conical hat, just like in "Lessons for a Master." However, the piece is recolored, having blond hair like young Wu and a brown headband. Garmadon uses Lloyd's hair piece from The Island, also recolored to have red-brown hair and a purple headband.
- Both brothers wear backpacks represented by the piece originally used on the Hiker from 71013 Minifigures Series 16 and later used on Zane in the 71019 The LEGO Ninjago Movie Series.
- Wu's sandals and legs are similar to those of his counterpart in The LEGO Ninjago Movie.
- Garmadon's torso is similar to Nya's Samurai X suit Jungle variant.
- Garmadon has the style of knee pads seen on the ninja's Jungle robes.
- The concept is based on market research that showed young fans wanted to learn more about Wu and Garmadon in their younger years.
- According to Tommy Kalmar in Episode 43 of TTV's NinjagoCast, these books take place during a particular part of The Book of Spinjitzu.
- According to Tommy Andreasen, he believes four Spinjitzu Brother books will be released, but it's only a guess.
- Unlike the other ninja, Zane and Lloyd have different designs instead of the ones they have in the show.
- While Zane is featured to having his human cloak on, he is depicted to have black eyes instead of blue ones. He also has his pre-movie hair piece in the prologues, while he has his post-movie hair in the epilogues.