Black Mesa Security Guard (Evolution)

The Black Mesa Security Guard, also known as Barney (not to be confused with Barney Calhoun) are friendly entities found throughout almost the entirety of Half-Life. They are the quintessential partner to the player throughout the game, and are one of the only friendly forces you face. The Security Guard went through several different looks throughout Half-Life's development, changing both posture and faces before ending up with the man we all know and love.

Version 1: Chuck Jones Concept Art

Commonly overlooked by most people, the earliest appearance of the Security Guard is within Chuck Jones's concept art for the Panthereye. His design is quite odd as he is shown donning a pair of thick lens glasses and a much more elderly appearance, something that no modeled version of the character ever had. This makes it very easy to overlook and assume he is a scientist however the over turned security guard helmet near the hind legs of the creature is all the proof needed. He also appears to be reaching for a type of gun that never made it into Half-life.

Version 2: Pre 0.52 Alpha

The Earliest in game image of the security guard appeared in a PC Gamer article from July 1997; predating the 0.52 build by two months.