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The subject matter of this article contains in-development information that was cut from the final version of an official and/or canonical source and appears in no other canonical source. It may also contain incomplete information since not all cut material is publicly known.
Soldier / Assassin
The Alien Assassin, also known as the Combine Alien Assassin, the Breeder, the Shock Trooper, and the Prowler, is an enemy cut from Half-Life 2. It is the original form of the Fast Zombie.
The Alien Assassin has long claws used for slashing targets, red spikes on the top of its head, a breathing mask and pipes in its eye orbits, and apparently only two toes. Like the Combine Assassin, it is likely that it was to be a quick and resourceful enemy, moving swiftly and performing flips, rolls, and other movements. Furthermore, it was to fire smoke to conceal its movements, throw Hopwire Grenades and knives stored on its back, and quickly pounce the player. It was also to have a Zombie version as the Zombie Assassin, but it was never completed.
Both the Alien Assassin and the Cremator bear some similarities. They have an identical orange sphere on the back of one hand, looking like some sort of lid (the right hand for the Alien Assassin, in lower resolution, the left for the Cremator), similar arms and hands (except that the Cremator has only four fingers), and also lines on the hands (although the Cremator has them on its gloves instead of the skin like Alien Assassin). This suggests they were to be related in some way.
Behind the scenes
A related sound file, "ball_zap1.wav", can still be found in the Half-Life 2 files, in the folder "/sound/npc/assassin/". Similar to a Stun Baton sound, it was likely related to the Assassin's Hopwire Grenades. The sound file "tattle1.wav" located in the sound folder for the Alien Assassin in the Half-Life 2 leak files indicates the Assassin was at some point to taunt the player. However the record seems to be temporary as it is made in a childish way, with a falsetto/Muppet-like voice.
Walking, in a Nosferatu-esque way.