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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   Gordon Freeman

   Gordon is seen three times by Barney Calhoun during the course of Half-Life: Blue Shift. ... | Gordon Freeman |
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   Half-Life: Blue Shift

   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

   | Gordon Freeman | ... | Barney Calhoun |
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   Black Mesa Research Facility

   Gordon Freeman · Adrian Shephard · Barney Calhoun · Doctor Gina Cross · Doctor Colette Green · Chell
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   Locations in the Half-Life series

   Doctor Gordon Freeman · Corporal Adrian Shephard · Barney Calhoun · Doctor Gina Cross · Doctor Colette Green · Chell
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   Alyx Vance

   Barney Calhoun additionally mentions that Freeman is a "lucky dog" to travel alongside Alyx.
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   The Resistance (Half-Life 2)

   Gordon Freeman · Adrian Shephard · Barney Calhoun · Doctor Gina Cross · Doctor Colette Green · Chell
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   Half-Life (video game)

   From its release in 1998, Half-Life saw fervent support from independent game developers, due in no small part to support and encouragement from Valve Software. ... Doctor Gordon Freeman · Corporal Adrian Shephard · Barney Calhoun · Doctor Gina Cross · Doctor Colette Green · Chell
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    Doctor Rosenberg

    Doctor Gordon Freeman · Corporal Adrian Shephard · Barney Calhoun · Doctor Gina Cross · Doctor Colette Green · Chell

Explore the following pages on Powerset:

• Barney Calhoun,
• Gordon Freeman,
• Half-Life: Blue Shift,
• List of Half-Life universe characters,
• Black Mesa Research Facility,
• Locations in the Half-Life series,
• Alyx Vance,
• The Resistance (Half-Life 2),
• Half-Life (video game),
• Doctor Rosenberg