- Play as Adrian Shephard, a HECU soldier assigned to kill the Black Mesa personnels, especially Gordon Freeman. But, the assignment may not be easy as he thought.
- Set in the same time frame as the original game, you now play one of the army grunts sent to eliminate Gordon Freeman when you realize that he is the least of your worries. Now, you must fight though the Black Mesa facility and face the alien invasion if you want to get out alive.—Paul Lacayo
- Chapter by Chapter:
Welcome to Black Mesa: Adrian Shepard, a marine sent to eliminate Gordon Freeman, is in an Osprey helicopter with his friends and his sarge. However, his helicopter is shot down and his sarge did not even give him his orders. Shepard awakes in an infirmary where he discovers that his friends are dead. With no orders, he must proceed forward and seek help.
We Are Pulling Out: Shepard arrives at a hangar area where he finds a large group of marines that seem to be evacuating the area. Shepard attempts to board their helicopter, but he is too late.
Missing in Action: All alone, Shepard needs to go through a ventilation shaft, a blast furnace, and a garage in order to search for any remaining marines also left behind.
Friendly Fire: Shepard explores an office complex which is now infested with Vortigaunts. He needs to make it to Lambda Complex and try to catch up to Gordon Freeman, but first he must eliminate a group of Black Ops soldiers who plan to detonate a thermonuclear device.
We Are Not Alone: Shepard arrives at the Lambda Complex just in time to see Gordon jump into the portal to Xen. Shepard realizes that he failed his primary objective, and must travel to Xen to find a way out of Lambda Complex.
Crush Depth: Shepard is teleported out of Xen to an underwater research facility where several Itchyosaurs are being held. He needs to get back to the surface to aid his fighting marines.
Vicarious Reality: Shepard reaches a facility where alien species and habitats are being studied. Shepard needs to cooperate with the scientists there so he can reach the surface.
Pit Worm's Nest: Shepard comes to a waste disposal plant where a giant Pit Worm is killing the marines. Shepard needs to dump toxic waste on the creature in order to escape.
Foxtrot Uniform: Fresh from his victory against the Pit Worm, Shepard needs to regroup with his squad of marines at the surface in a cargo storage area. He is forced to travel in an underground maze filled with an alien type called Voltigores and he must kill a Gargantua on a dam.
The Package: Shepard needs to aid his squad in the fight against the Black Ops and he must stop them from detonating their thermonuclear device in the Black Mesa Parking Garage.
Worlds Collide: Shepard finally makes it to an underground storage facility where the Gene Worm is attempting to come through a giant underground portal. Adrian must kill it. After he has done so, he is put under a stasis by the 'G-Man'.
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