D0g
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D0g (pronounced the same as dog) is a robot in Valve Software's 2004 first-person shooter computer and video game Half-Life 2. Doctor Eli Vance built D0g to both celebrate and protect his daughter, Alyx, more than two decades prior to the events of Half-Life 2 when she was young. D0g started out as a relatively small, four-foot robot, but as Alyx grew up she added more and more parts to it, "upgrading" it so to speak – and it now towers ten feet high.
Characteristics
D0g, much like a real dog, is very friendly, loyal and has an intelligent personality. If the player looks at it while it's idle, it may perform a dance. D0g makes friendly and playful noises such as beeps and whines, as well as less-friendly roars when provoked. The robot's body is constructed largely of scrap metal, hydraulics, and wires, with what appears to be a scrapped Combine scanner for a head.
D0g has a zero-point energy device much like the Gravity Gun to pick up and throw things. D0g has amazing strength, and can prove extremely useful through the course of the story, as it can throw large objects (such as vehicles) at enemies or pry open areas which are otherwise inaccessible to Gordon. D0g seems to be completely invulnerable to any damage used in-game; it never takes apparent damage from any source including weapons, fire, or explosions. However, D0g is not invulnerable; he simply has a huge amount of health to make sure he does not die in-game (as opposed to using very fast regeneration of health, as Alyx does). It is possible for him to die, but this can only be observed if the player spawns him using the console in a combat situation that he would not normally be involved in.
D0g does not have any combat AI, and all in-game scenes with D0g involving fighting are scripted. If a spawned D0g is approached by something as threatening as a common headcrab, the spawned D0g will flee. If no enemies are present, he will find any nearby small objects and throw them at the player like he did in the game of catch at Black Mesa East.
D0g's character, even though important to the story, also plays a recognizable role as comic relief for the game. His battle sequences are often humorously exaggerated, where player can see him throw large objects like cars at great distances, or furiously attack disoriented and panicking groups of enemies without caring for consequences nor taking any noticeable damage, whether it is crushing a handful of soldiers or taking a dropship head-on.
Valve commented on the Half Life 2: Episode One commentary that players love D0g, so they made him the first thing the player sees at the start of the episode.
In-game appearances
Gordon Freeman is first introduced to D0g in the Black Mesa East scrapyard. As a part of a tutorial on operation of the Gravity Gun, Alyx arranges a game of "fetch" between Gordon and D0g, using an inert Combine roller mine as the ball. The game is interrupted by a Combine assault on Black Mesa East. D0g opens the passage to an unused tunnel leading towards Ravenholm for Gordon to help him escape. While Gordon enters the tunnel, D0g stays at Black Mesa East to help Alyx and others defend the lab.
Gordon meets D0g again after he and Alyx teleport from Nova Prospekt to Doctor Isaac Kleiner's lab in the end of Entanglement. The company splits again – when Gordon and D0g set off to find and join Barney, Alyx stays with Dr. Kleiner who refuses to leave without his pet headcrab, Lamarr. As Anticitizen One begins, D0g is quick to leave Gordon behind and charge at a nearby group of Combine troops outside the lab, tossing a ruined car at them and even fighting off an APC. He then tears apart a gate for the player, allowing him to proceed. However, D0g himself goes berserk immediately after and jumps aboard a Combine dropship, departing into the unknown. It is worth noting that this whole scene – unlike other sequences where supporting characters fight alongside Gordon – is entirely scripted, and as such requires no involvement from the player at all.
Apparently, D0g eventually manages to find Barney, as Gordon meets both of them in the square toward the end of the chapter "Follow Freeman!" in a scene where D0g, in the heat of the battle, knocks over a large statue of a horse that was the player's goal during the last part of the chapter. As Barney reports to the player, D0g is probably aware of the fact that Alyx is already in the Citadel, and so tries to reunite with her, being completely uncontrollable to others. The last we see of D0g is when he, once again, opens a passage for Gordon – this time allowing him to enter the Citadel.
opens with the player under a pile of rubble from which D0g lifts him. D0g then proceeds to aid Alyx and Gordon in first contacting Eli Vance and Dr. Kleiner (by using his body as an antenna), and then resolving the issue of entering the Citadel by throwing Alyx and the player across a dividing ravine in a burnt-out van. D0g is told by Alyx to return to her father, and is not seen again for the rest of the game.
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