| NPCs | ||
|---|---|---|
| Black Mesa | Scientist · Security Guard | |
| HECU | Grunt · Engineer · Medic · Sergeant | |
| Black Ops | Female Assassin · Male Assassin · Bodyguard | |
| Aliens | Alien Controller · Alien Grunt · Alien Slave ·
Baby Gargantua · Baby Headcrab · Baby Voltigore · Barnacle · Bullsquid · Chumtoad · Gargantua · Gene Worm · Gonarch · Gonome · Headcrab · Houndeye · Ichthyosaur · Kingpin · Leech · Nihilanth · Panthereye · Pit Drone · Pit Worm · Shock Roach · Shock Trooper · Snark · Stukabat · Tentacle · Voltigore · Xen Commander · Zombie | |
| Machines | Large Mounted Turret · Small Mounted Turret · Sentry Turret · Robot Grunt | |
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