The technological leap of mankind did not go unnoticed from the outside. In the midst of cities, portals opened, from which swarms of merciless creatures poured in, wanting only one thing - to destroy mankind.
To stop the invasion, people had to use nuclear arsenal, firing missiles at their own cities.
Everyone thought that this would be enough, but if the portals were corrupted, the remnants of the aliens managed to adapt, building mobile laboratories where new ‘soldiers’ were created from biomass and metal for the sole purpose of destroying mankind.