Henry and Denzel argue over whose grandmother is better before the Iron Granny competition. So, Henry helps his grandmonster, Nan-Oh, train for the Iron Granny competition, but Denzel helps his Grand-Moh train as well! Soon, the boys get competitive about who will win. / When Grando visits Henry's house and shows Henry a very special monster coin called a spinner, Henry soon loses track of the coin, so Cobby uses his newest invention, the "Listening Laser," to find the coin.