Kevin (Black Ops)

Kevin was Andy Shephard's best friend during their mission to Black Mesa during the Black Mesa Incident, although he later turned out to be the main antagonist.

Biography
When the black ops were sent to Black Mesa to help deal with the alien invasion once and for all, Kevin, along with his friend Andy Shephard, were dispatched as well. They proved to be a good team when dealing with the aliens. During their mission Kevin fell in love with a female scientist known as Holly Jones and planned to spare her life so disguised her in a black ops uniform, although she later perished when accidentally being teleported to Xen after setting off a displacement cannon.

Kevin later showed his true colours when he betrayed Andy and showed loyalty to the G-Man, who had employed Kevin to do his bidding. He tried to kill Andy but Andy managed to escape. Kevin set up a nuclear bomb to destroy Black Mesa, but was killed by Adrian Shephard (Andy's brother), who subsequently defused the bomb. But after Shephard left the area G-Man arrived and reactivated the bomb. Kevin later awoke with a flesh wound and panicked when he saw the nuclear device was reactivated and he was at the heart of where the explosion would take place. He was killed when the facility was successfully nuked, although Andy was left unaware of his old friend's fate.