A new union is formed as Giaris and Leonidas work together to defend Sparta from enemy invaders. So consumed in matters on the battlefield, the two are unaware of a traitor in their midst. As they lead a Spartan war party to cut off an invasion force, Giaris and Leonidas are ambushed as they have been unknowingly betrayed. If these impending invaders are able to stop Giaris and Leonidas, will Sparta fall next?