The Blacklight virus, dubbed now as the Mercer Virus by the general public, is an evolutionary chimeric mutation-causing infectious agent that can reproduce only inside the living cells of other biological organisms. It was extracted and synthesized by Gentek, using a sample of Elizabeth Greene's blood, which had been infected with the Redlight virus years previously. After infection, the virus "plugs in" and activates the 'junk' DNA in its victim, resulting in several biological changes that create (and recreate) sentience within the infected creature's cellular makeup. It acts by affecting the protein encoding regions of the promoter introns in each cell. As a retrovirus, it contains both RNA and the reverse transcriptase enzyme, allowing it to insert its own genetic codes into the host's cells. It enters, re-purposes and changes the cell, replicating previously dormant non-coding segments of the organism's DNA. More often than not, these changes are too drastic and 99.99% of all infected organisms die from massive organ failure and cell saturation. However, few variants have yielded other beneficial results, endowing the infected organisms with incredible superhuman genetic prowess that greatly increase their natural abilities to levels far exceeding human capability; these variants include DX-1120 and DX-1118 C.