Finding:

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   The Coast (Half-Life 2)

   Judging by the presence of headcrab canisters, small portions of the Coast have become infested with zombies and other Xen wildlife. ... Also, Gordon finds a zombie and several corpses in a small camp at the foot of a cliff, and a fast zombie in a pipe, suggesting that some humans had hidden there.
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   Father Grigori

   Eventually, Grigori escorts Freeman through a cemetery infested with zombies to show him a hidden passage to the mines out of the haunted town. ... There are several instances in Half-Life 2: Episode Two where Gordon encounters zombies and Antlion grubs that have been mangled in a similar manner to the zombies found in Ravenholm, possibly hinting that Father Grigori survived the events of Half Life 2 and Episode One.
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   Combine Forces

   Snipers seem to take the doctrine "shoot anything that moves" quite literally, shooting at any living creature (besides Combine forces) such as headcrabs, zombies, and even birds. ... In any case, Gordon Freeman never encountered them during his jaunt through City 17.
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   Headcrab

   Because headcrab zombies are slow, they are often found in confined spaces and/or in large numbers to compensate. ... Gordon Freeman · Adrian Shephard · Barney Calhoun · Gina Cross · Colette Green · Chell
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   John Freeman (Half-Life Character)

   As both zombies and ghosts are traditionally thought to be immune to such weapons, how John Freeman is able to defeat them is a mystery. ... He finds Gordon fighting the 'final boss'.
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   List of Half-Life universe characters

   Barney is encountered in the penultimate chapter of Half-Life 2: Episode One, where he provides the player a replacement for the crowbar destroyed in the Citadel in Half-Life 2, and suggests that Alyx and Gordon provide a diversion so the remaining citizens can approach the train station. ... Eventually, Grigori escorts Freeman through a cemetery infested with zombies to show him a hidden passage to the mines out of the haunted town.
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   Concerned

   In Half-Life 2, the player takes on the role of Dr. Gordon Freeman. ... The town is fired on with headcrabs, killing many and turning others into zombies.
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   Concerned: The Half-Life and Death of Gordon Frohman

   In Half-Life 2, the player takes on the role of Dr. Gordon Freeman. ... After adjusting, Frohman becomes accustomed to the town, but unintentionally discloses the town's location to Dr. Breen, who immediately orders his forces to "bomb the shit out of them" with shells filled with headcrabs, killing many and turning many more into zombies.
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   Concerned (comics)

   In Half-Life 2, the player takes on the role of Dr. Gordon Freeman. ... After adjusting, Frohman becomes accustomed to the town, but unintentionally discloses the town's location to Dr. Breen, who immediately orders his forces to "bomb the shit out of them" with shells filled with headcrabs, killing many and turning many more into zombies.
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    Creatures in the Half-Life series

    A Gonarch is one of the creatures from Xen; only a single Gonarch is encountered by Gordon Freeman during the game. ... They are also able to throw physics objects like zombies can.

Explore the following pages on Powerset:

• The Coast (Half-Life 2),
• Father Grigori,
• Combine Forces,
• Headcrab,
• John Freeman (Half-Life Character),
• List of Half-Life universe characters,
• Concerned,
• Concerned: The Half-Life and Death of Gordon Frohman,
• Concerned (comics),
• Creatures in the Half-Life series