Three years in the making, I present my first megawad Operation Portalus for GZdoom (1.8.2). The story takes place after the invasion on Earth. People are rebuilding destroyed cities, but some demons have survived. There are special teams, which kills these demons. Besides this, they are also search traitors. One day, they finally find one, who helped to open the gate on Earth. Main hero enters into his complex to eliminate him. But then he discovers, that the gates were opened again. Together with another teams, he must close them forever. He will travel throught many locations such as old factories,cities and even in time !