Headcrabs are a parasitoid alien race found in the Half-Life series of video games, originating in 1998's Half-Life. It is a creature that attacks people, trying to latch onto their head. Upon doing so, it begins to take control of their motor functions, turning them into zombie-like creatures that appear to retain their intelligence and emotions despite lacking the ability to express them in this state. The sequel, Half-Life 2, feature multiple new Headcrabs such as fast and poisonous ones, each creating different Headcrab Zombies. The Half-Life development team was split on making Half-Life: Alyx (2020) a virtual reality game, with the fact that the Headcrabs would be jumping at the player being both an upside and downside depending on the perspective. They initially intended to feature fast Headcrabs and zombies, but opted to not do so when they saw that players struggled too much to deal with them. Critics identified this appearance as particularly terrifying, stating that the inclusion of the Headcrabs justified making the game on a virtual reality platform. The Headcrabs have been generally well received, considered by multiple critics to be a particularly scary and effective monster. Of particular note was their ability to take control of people's bodies, with one critic commenting that the execution was more akin to The Thing (1982) rather than the zombies from George A. Romero's films.
Appearances The Headcrab debuted in Half-Life (1998) as an enemy that attacks protagonist Gordon Freeman and other surviving humans by leaping at them and biting them. Headcrabs first appear when a portal is opened, sending various interdimensional beings into the game's world and sending the Black Mesa lab into chaos. Throughout the game, the player encounters bodies with Headcrabs on their head, some of which becoming animated and attacking living people. In the sequel, Half-Life 2, the Headcrab and Headcrab Zombies return in a similar capacity. Headcrabs can be found in various environments, and the main antagonists, the Combine, who have taken control of the world post-invasion, have been attacking civilian and resistance groups by shooting rockets with Headcrabs in them to infect the population. Other Headcrabs appear, including a fast one and a poison one, the latter of which can put Gordon in serious danger if bitten. The character Isaac Kleiner manages to debeak a Headcrab, keeping it as a pet called Lamarr. Headcrabs also appear in Half-Life: Alyx, a virtual reality game. Fast-moving Headcrabs and Zombies were originally considered for inclusion, but were removed due to tests finding that they moved too fast for players to properly react. Outside of the Half-Life series, the Headcrab makes multiple cameo appearances. Multiple games, such as Vindictus and the Steam releases of Phantasy Star Online 2, Death Stranding, and Fall Guys featured accessories based on the Headcrab. An update to Two Point Hospital (2020) on Steam added a patient suffering from a Headcrab attack, while the Steam release of Super Meat Boy featured a playable Headcrab. The Headcrab has received multiple pieces of merchandise, including a 1/4 scale Headcrab Zombie and a plush.
Concept and creation Headcrabs are a race of dog-sized alien creatures that leap at people's heads in order to latch onto them and turn them into zombie-like creatures that move slowly. Headcrab-controlled zombies are suggested to retain the capacity for intelligence and emotion without the ability to properly express it. When they regain control after the Headcrab is killed, they are able to speak before death; for instance, when set on fire, the host can say "I am burning. Please God, kill me. I am burning". Early prototypes for the Headcrabs gave them butts and were colored "faecal brown". The first Half-Life features the standard Headcrab, while Half-Life 2 introduces two new Headcrab variations: the fast Headcrab, which creates fast zombies, and the Poison Headcrab, which creates slower and more durable zombies. When designing Half-Life: Alyx, the team was in two camps, with the ability for a Headcrab to jump at the player's face in virtual reality being the reason some supported it and others opposed it. When designing the Headcrab in this game, it was designed to have a percentage chance for it to miss in its leap, thinking this made them more fun to interact with.
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