Alien Assassin

The Alien Assassin, also known as the Breeder , Prowler, and the Shock Trooper , is an enemy cut from Half-Life 2 and another concept for the Combine Assassin. They both found their way into the final version of Half-Life 2 into the form of the Fast Zombie.

Depiction
The Alien Assassin has long claws used for slashing targets, a breathing mask and pipes in its eye orbits. Like the Combine Assassin, it is likely that it is a quick and resourceful enemy, moving swiftly and performing flips, rolls, and other movements. Animation names for the leaked model reveal further attacks: it could fire smoke to conceal its movements, throw Hopwire Grenades, and quickly pounce the player. It was also to have a zombie version, but it was never completed.