Child's Play

The episode begins with Lloyd lamenting that he must train and not play with others or enjoy his youth. Nya then tells the Ninja that Lord Garmadon has been spotted at the city museum. Once there, Lord Garmadon tells his Serpentine followers that he is going to awaken the long dead Grundle, an ancient dinosaur-like creature, and make it hunt the Ninja. In the middle of this process, the Ninja interrupt. They jump on the fossil, but nothing seems to happen at all. Garmadon leaves in a fury, while the Serpentine Generals try to steal a golden sarcophagus for compensation, though they soon leave it behind. The Ninja go after them, but fall behind, and then realize they have been turned into kids by the Mega-weapon's blast. Accused of the thefts, the Ninja try to perform Spinjitzu, but fail dismally, and then the museum director asks them why the Grundle fossil is gone too. The Ninja realize it must have been reawakened and walked off. To escape, the Ninja disguise themselves and run away with some school kids, while the Grundle reappears and scares everyone from the museum. The Ninja call Lloyd and they meet at the arcade, where Lloyd is shocked at what happened to them. He brings them to a comic writer he knows, Rufus "Mother Doomsday" McCallister, to ask him for advice. The writer tells him that a couple of illuma-swords would work well, as the Grundle is nocturnal, but they must win them in a comic knowledge competition. They call Sensei and Nya and tell them what happened. Sensei and Nya then go to the tea lady Miss Take for Tomorrow Tea to turn the Ninja back into their older selves and the Grundle back into bones. Meanwhile, the Grundle shows up at the comic shop, but using the illuma-swords and Lloyd´s powers they manage to hold the Grundle at bay until Sensei and Nya turn up. Lloyd uses the tea to undo the spell of the Mega-Weapon on the Grundle and the Ninja, but it also makes Lloyd become an older version of himself. The episode ends with Rufus handing Lloyd a comic, saying he has earned it. Lloyd declines, saying he already knows how it ends. It is a comic where Lloyd faces off against his father under the stylized title of "Green Ninja".