Jay, Ninja of Lightning — Greg Farshtey

Sensei Wu has gathered a powerful team of ninja warriors. Now he must train them in the ancient art of Spinjitzu. If he fails, Lord Garmadon and his evil skeleton warriors will destroy the land of Ninjago and
all of its inhabitants.

Faced with such a serious task, the ninja have little time for laughter -- that is unless Jay, Ninja of Lightning, is nearby. An inventor at heart, Jay never loses his sense of humor, even in the middle of a battle. But when Jay laughs in the face of danger, will the joke be on him?