A half Life1 Opposing Force mod. You're Corporal Shepard. A Soldier which arrives at Black Mesa in an alternate reality. Another Experiment went wrong and your mission: To find out what happened in Black Mesa and rescue the trapped personnel in it.
What a bitter end for Barney.
poor barney :(
All security personel in Black Mesa are called Barney? (hehehe)
GO PLAY SOME HALF LIFE
Otis FTW!