Finding:

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   Barney Calhoun

   It should be noted that the Barney Calhoun from Blue Shift never actually meets Gordon Freeman in the course of the game itself, although Gordon's tram passes by Barney at the start of Blue Shift as he is trapped outside a locked door.
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   City 17

   The Citadel is found around almost every corner due to its towering height. ... Barney Calhoun, disguised as a Combine Civil Protection officer, eventually finds Gordon and aids in his escape from the train station.
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   Gordon Freeman

   Found in Half Life 2. ... Gordon is seen three times by Barney Calhoun during the course of Half-Life: Blue Shift.
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   Concerned: The Half-Life and Death of Gordon Frohman

   Frohman is drafted into the resistance by Barney Calhoun after failing to disrupt their operations, and unintentionally signals the start of the resistance's uprising by accidentally killing a Combine police officer using one of his Antlions. ... Concerned: The Half-Life and Death of Gordon Frohman.
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   Concerned (comics)

   Frohman is drafted into the resistance by Barney Calhoun after failing to disrupt their operations, and unintentionally signals the start of the resistance's uprising by accidentally killing a Combine police officer using one of his Antlions. ... Concerned: The Half-Life and Death of Gordon Frohman.
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   Codename: Gordon

   After making his way through a few zombies and headcrabs, Gordon meets with Barney Calhoun, a prominent character in the later Half-Life titles. ... ↑ The Nuclearvision Entertainment home site could previously have been found at http://www.nuclearvision.de, now a defunct website.
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   Alyx Vance

   Upon being found out, she says "Ha ha, gotcha." ... Doctor Gordon Freeman · Corporal Adrian Shephard · Barney Calhoun · Doctor Gina Cross · Doctor Colette Green · Chell
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   Half-Life: Blue Shift

   Level/area: Focal Point (in English). (2001) “Stanley Rosenburg: Some of the more promising research on the matter led to a device that could be attached to the strange crystalline structures we found on this borderworld. ... Doctor Gordon Freeman · Corporal Adrian Shephard · Barney Calhoun · Doctor Gina Cross · Doctor Colette Green · Chell
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   List of Half-Life universe characters

   The Weighted Companion Cube can be found in the game Portal. ... Gordon Freeman · Adrian Shephard · Barney Calhoun · Doctor Gina Cross · Doctor Colette Green · Chell
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    Black Mesa Research Facility

    This facility can also be accessed in the Opposing Force expansion pack by activating the alt-fire on the Displacer in the map the weapon is found in. ... Gordon Freeman · Adrian Shephard · Barney Calhoun · Doctor Gina Cross · Doctor Colette Green · Chell

Explore the following pages on Powerset:

• Barney Calhoun,
• City 17,
• Gordon Freeman,
• Concerned: The Half-Life and Death of Gordon Frohman,
• Concerned (comics),
• Codename: Gordon,
• Alyx Vance,
• Half-Life: Blue Shift,
• List of Half-Life universe characters,
• Black Mesa Research Facility