Several young people find themselves locked in a bunker; a mysterious man informs an esteemed scholar, professor Radomskiy, that his daughter has been kidnapped and forces the father to go back to work.

A mutating virus sweeps through the population, causing massive casualties; the young people locked in a bunker are trying to figure out why they're being held against their will.

A rescue worker, Max, returns to Moscow to find his sister; Professor Radomskiy tries to escape his captors; someone locks Ira and Mitya in the walk-in fridge.

Valera smashes all the surveillance cameras in the bunker; the Summit corporation board of directors is concerned with the virus leak; professor Radomskiy scours the city searching for Ira.

A man stumbles into the bunker, covered in blood; the captives take his key to the bunker and escape; once they reach the surface, a small group leaves on a scouting mission.

The zombie women kill a group of soldiers with their horrifying wailing; Irina and several others try to save the bloodied man by going to the hospital to get some blood for a transfusion.