Masters of Spinjitzu: a force to save the world! There's a new hero in town — a mysterious masked Samurai who is stealing the ninja's spotlight! They complain of a competing hero, but Sensei Wu thinks competition will be good for them. Meanwhile, the ninja go on a snake mission which leads them to the snake arena. In the arena, the ninja are ordered to face another captured foe...the mysterious Samurai! Will this be the ninja's end? Or will a friendly face be behind the Samurai's mask?