Made by Gearbox Software and originally released in 2001 as an add-on to Half-Life, Blue Shift is a return to the Black Mesa Research Facility in which you play as Barney Calhoun, the security guard sidekick who helped Gordon out of so many sticky situations.
The protagonist isnt as great a Gordon Freeman, but Barney Calhoun is not bad at all.
It was fun playing as one of the security guards, see what happens while Gordon kicks *** elsewhere.