- "My name is Alex Mercer. I'm the reason for all this. They call me a killer, a monster, a terrorist... I am all of these things."
- ―Alex Mercer
Alex Mercer, codename: ZEUS, was the former head researcher of the Blacklight project at Gentek. After learning that those affiliated with the project were being killed one by one, Alex tried to flee out of the city with a vial of his research. Cornered at Penn Station, Alex was forced to utilize the vial, and smashed it to the floor, unleashing the deadly virus onto the area, which later cover all of Manhattan Island.
After awaking at a Gentek facility with no recollection of his past, Alex Mercer escapes the building, and soon discovers his new found powers and abilities, granted by the virus he unleashed. With this, he begins to utilize his powers in order to learn more of his fragmented past, as he scoured all of New York for those responsible.