Prototype Ultimate Evolution

Prototype Ultimate Evolution,

kei a high school student and a very talented hacker , one day got a chance which change his life.
He got ability to travel between world i.e, games ,movies , anime , manga , novel , etc.
But, in first world he died a tragic death but got reborn and have become Alex Mercer from game Prototype.

Who is he ?
How he get this power ?
What is its purpose ?

Lets find out in his journey.
As he travels alone in each world as only his body can pass from gateway of different world.So, he is meant to be alone but in each world he will have friends and family which he never had before so is it blessing ?

But is he a Savior or a Destroyer.