10 Video Game Bosses Who Killed Other Bosses
2. Alex Mercer - Prototype 2 (2012)
Once the reluctant antihero, now an unstoppable force of evil in the world, Alex Mercer reappears in Prototype 2 to take on the series' new protagonist, James Heller.
A living incarnation of the Blacklight virus, Mercer has begun to infect select people within Gentek and Blackwatch, making them into 'Evolved' that have powers much like his own. Though Heller is one of these, technically speaking, he's certainly not about to side with the man who caused the deaths of his wife and daughter.
Several Evolved feature as bosses throughout Prototype 2, making for some pretty evenly matched fights. At the very end of the game, when Heller fights his way to the heart of the Red Zone, the birthplace of the virus, Mercer is waiting for him with one last trick up his sleeve.
He absorbs all of the Evolved he has created, consuming them and assimilating their powers to become a terrifying amalgam of all their powers. The boss fight that ensues is anything but easy, which is fair enough, considering he's now technically many, many bosses rolled into one.