"Armada" is a large science fiction work by Ernest Cline, the author of the worldwide bestseller "Ready Player One," which was adapted into a film by Steven Spielberg. Zack Lightman is a dreamer and a geek. He prefers to spend his free time in front of the computer, and he excels only in "Armada," a virtual reality shooter where an alien species attempts to conquer Earth. His life resembles that of many other gamers. Until one day, a real alien spaceship appears over his hometown - and the computer game turns into a bitter reality. As the first waves of alien ships approach, it is solely the gamers who are capable of fighting them in drone combat. The best among them are recruited and trained by the Earth Defense Alliance. From a secret operations base on the moon, Zack and his friends wage a war that determines the fate of Earth.