After Grandfather quits, his new assistant Andrea takes over and the ninja's have to save the day by getting Andrea things? That means that there is no mission for them to go on and Mike isn't handling it well.
Mike, Owen and Amanda are stuck in detention and secrets are unearthed as they figure out who among them is Jelly Face, a person who has escaped prison and assumed the identity of a student to exact revenge at Homecoming.
The evil Ishina Clan tries to find the dojo in order to defeat the Fukanaga Clan. While trying to defend the dojo, Mike learns it's his destiny to protect the Floating Sword from the Ishina, who won't stop until they possess it.
Dollhouse, a villain who appears in a white porcelain doll mask turns ordinary people into "living dolls". When Amanda is kidnapped by Dollhouse to be the perfect cheerleader in his doll collection, Owen and Mike must save her.
After learning about the disappearance of an under-cover police detective, the Supah Ninjas discover that the villain Checkmate, a former chess prodigy, is to blame. The Ninjas must now enter into Checkmate's dangerous world.
Owen is having a hard time with the boring discipline side of Grandpa's teachings. When he recognizes that an old friend is part of the dangerous Subsiders parkour crew, Owen infiltrates their underground lair to save him.
Mike is nervous and unsure about what to do on his first date with Julie. Amanda helps Mike by doing a practice date with him, and its clear the two still have feelings for each other.
Owen is in a bit of a crime-fighting slump, so Mike and Amanda try to cheer him up by taking him to a concert at the school by their favorite deejay, DJ Elephant Head. But soon they realize DJ Elephant is a dangerous criminal!
Katara Sharp, a seemingly klutzy bookish-type, is actually a knife-throwing cat burglar obsessed with stealing priceless antiquities. While the Ninjas are on to her, she'll stop at nothing to get what she wants.