Book of Isaac

About 50 kilometers from the city of Krestown, at the barren circle. Isaac, with the help of his friends, was fighting against his father and Martin. In the middle of this fierce battle, strange extraterrestrial invaders break into their world through a portal, heading straight for the city. As they watch in shock, some extraterrestrial beings land at them and start attacking. They have no choice but to join forces to fight these invaders and protect the city of Krestown and its people from this new, deadly threat.