Christmas Ninjas was a very popular convention game, especially with the addition of the Rocking Out rules. After all you aren't just playing panda and penguin Christmas Ninjas, you are also rockstars!
There is a war to save Christmas. And on the front lines are the much maligned Christmas Ninjas. Some say these noble warriors are monsters, though they fight to save Christmas from Santa Claus and his secular elven legions. Some say that the ninjas are poor musicians, though the magic of the 80s hair bands was but a shallow reflection of the Christmas Ninjas talents.