Alex Mercer is a fictional character and the main protagonist of the video game series Prototype. He is a former scientist who gains extraordinary powers after being infected by a viral outbreak. This virus allows him to shapeshift, absorb memories, and gain the abilities of others, making him a formidable force. In the game, Alex seeks to uncover the truth behind his transformation and the organization responsible for the outbreak. His journey involves battling various enemies, including military forces and mutated creatures, as he navigates a world filled with chaos and conspiracy surrounding the Blacklight virus.