Triangulum: Battle for Earth is a look at today's geopolitical world. Earth is on the brink of World War III. Warplanes square off above the Atlantic Ocean. As missiles race to make the first strike of World War III, the aliens attack. A divided world is ill-prepared for the unprovoked invasion by a superior alien force from the Triangulum galaxy. They strike without mercy as cities are reduced to rubble within hours. Aliens spread across Earth in five spaceships, killing millions on every continent.
Emma Henderson, a professor at MIT, leads her team to make dramatic advancements in robotics and artificial intelligence. Aliens close in on the Boston area shortly after Emma and her team flee to the Colorado mountains with the aid of the U.S. military. Emma's team develops an advanced drone with a laser weapon and advanced artificial intelligence in a secret Colorado base.
Navy pilots Ray Henderson, Emma's brother, and Jerry Blake fight for their lives in the air campaign against the aliens. Jerry Blake is shot down on the second day of the air war. Unaware Jerry escapes his burning plane, Ray mourns his loss.
Jerry soon discovers bandits and gangs from the big cities are looting and killing anyone left alive behind the lines. He finds other survivors, and together they fight to return to civilization.
While he is fighting for his life, the U.S. military discovers ways to stop the alien's spaceships only to learn that their fleet of tanks, supported by drones, is as deadly as their spaceships, only slower.
With every success Earth finds to defeat the aliens, they find a counter. Who will win the battle for Earth?