Finding:

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   Barney Calhoun

   Barney was joined by his co-worker Otis (named after another character from The Andy Griffith Show); both Barney and Otis helped Adrian Shephard, the protagonist of Opposing Force, in much the same way that Barney had helped Gordon Freeman in the original game, such as opening authorized access doors and killing some enemies along the game. ... | Barney Calhoun |
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   Doctor Rosenberg

   In Half-Life: Blue Shift, Barney Calhoun helped Dr. Rosenberg and two of his colleagues escape from Black Mesa. ... Doctor Gordon Freeman · Corporal Adrian Shephard · Barney Calhoun · Doctor Gina Cross · Doctor Colette Green · Chell
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   Gordon Freeman

   With the Combine now sending Striders to shoot the rocket down, Magnusson enlists Gordon's aid in stopping through the use of his special explosive charges known as Magnusson Devices and Gordon's Gravity Gun. ... Doctor Gordon Freeman · Corporal Adrian Shephard · Barney Calhoun · Doctor Gina Cross · Doctor Colette Green · Chell
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   Black Mesa Research Facility

   The nearby Silo E High Altitude Launch Center, a silo converted into a fully-functional satellite delivery rocket lauchpad. was used by the Lambda Team, with the help of Gordon Freeman, to launch the satellite that later helped repair the resonance cascade in Decay. ... Barney Calhoun lived in one of the Area 8 dorms.
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   Alyx Vance

   Barney Calhoun additionally mentions that Freeman is a "lucky dog" to travel alongside Alyx. ... Alyx helps Gordon more frequently and directly than any other character in Half-Life 2.
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   List of Half-Life universe characters

   Barney Calhoun ... He helps Gordon Freeman intermittently in Ravenholm, both through actions, including giving Freeman a SPAS-12 shotgun, and combat tips.
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   City 17

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

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

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

Explore the following pages on Powerset:

• Barney Calhoun,
• Doctor Rosenberg,
• Gordon Freeman,
• Black Mesa Research Facility,
• Alyx Vance,
• List of Half-Life universe characters,
• City 17,
• Half-Life: Blue Shift,
• Codename: Gordon,
• Concerned