When Ethan s grandma suggests they take a zip line to school, Ethan realizes that his grandma is a little different. In fact, she s a ninja Ethan is soon the hit of the school when his grandma drops from the ceiling at show-and-tell, and teaches the kids karate moves and how to do backflips in slow motion. But when his grandma deflates his team s soccer ball, everyone is upset including Ethan. Why can t he just have a regular grandma? But when Ethan tries out his new karate movesduring the championship game . . . he s happy that his grandma isn t ordinary."