Blacklight Virus is the main virus in video game, Prototype. It is created by Alex Mercer.
The Blacklight Virus originates from Hope, Idaho as Redlight. A group of soldiers have captured Elizabeth Greene, a survivor and carrier of it.
He created this already deadly virus into 10x deadlier and named it Blacklight. However, despite this, he is just a liability to Blackwatch, a secret military organization who owns Gentek. As a result, Alex runs his own investigation to learn that scientists with the knowledge of the virus are getting executed by Blackwatch.
Knowing he is targeted, Alex took off with the sample of Blacklight as "insurance" at Penn Station. However, Blackwatch also knows where he is headed and surround him, ordering him to drop the vial. Instead, Alex drops the vial to the ground, releasing the virus as he is gunned down to death by them.