|Affiliation||Master Yang (Formerly)|
|First Appearance||The Temple on Haunted Hill|
70590 Airjitzu Battle Grounds
At an unknown point in time, he was among the students taken under Yang's teachings, with Yang becoming infamous for his strict methods on him. However, unbeknownst to the public, he was secretly trapped in his temple, and after his death, were converted alongside his fellow students and mentor into ghosts.
As the morning came and the curse on Yang's Temple started to take effect on the Ninja, he showed himself, revealing the student to be chained up, as he was imprisoned by Yang. The Ninja then quickly fled to the entrance, not wanting to suffer the same fate as him and the other students. They manage to reach the entrance, but Cole dropped the scroll mid-way and thus had to go back in to retrieve it, which caused him to turn into a ghost. Fortunately he escaped the temple before he can meet the same fate as the students.
After Yang's temple was torn out of Ninjago to help construct Djinjago, he and the others left Yang's temple while Yang angrily confronts Nadakhan, claiming domain. However, the latter, unimpressed, promptly ordered Dogshank to shoot water at the students, forcing them to abandon the temple.
- Martin appears along with Chris as one of the Ghost students featured in the 70590 Airjitzu Battle Grounds set.
- Coincidentally, the two share the names of the Kratt brothers.