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The mysterious G-Man, also known as the Government Man, watches over Gordon throughout the Resonance Cascade. The G-Man was impressed by Gordon's survival of the incident, and he offered Gordon a job that he couldn't decline. Now, the G-Man brings Gordon to City 17 and assists him in his next 'mission'. |
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She is the young and talented daughter of Eli Vance. Alyx finds you struggling in City 17, and becomes your ally to fight against the Combine. |
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Eli was one one of your colleagues back in Black Mesa, he was also a survivor in the Resonance Cascade. However, his wife Azian didn't make it through the incident, he is Alyx's father and he's very protective of her. |
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He was your ass-kicking sidekick from Black Mesa, and he is still kicking some serious ass in City 17. You will meet up with Barney alot in the streets of City 17. |
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Dr. Isaac Kleiner & Lamarr

Dr. Kleiner was another of your scientist pals from Black Mesa. On his way out of the Black Mesa facility, he found a harmless headcrab which soon became his adorable 'pet', named Lamarr. Even though Kleiner says that Lamarr is completely harmless, she seems to have a grudge with Barney all the time. |
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Dr. Wallace Breen

Breen was the administrator in Black Mesa. When the Resonance Cascade was triggered and the Combine Overwatch was taking over Earth, he cowardly surrendered to the Combine, betrayed humanity, and soon became the leader of the Combine Overwatch
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Dr. Judith Mossman

Judith was the last of the survivors at Black Mesa. She was very jealous about how it should've been her in the test chamber in Black Mesa instead of Gordon. It seems that Judith and Alyx always has a very serious conflict with each other, and they never get along. |
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Father Gregori

He is a genius...as well as a maniac. This holy man lurks around setting traps and killing the undead in the zombie-infested town of Ravenholm. |
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He is a lovable, tiny pet that Eli built to protect his daughter...until Alyx starting building and adding on to Dog. Now he is an unstoppable, over-sized monster that will greatly help you on your mission.
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The resistance force of City 17 will eventually meet up with Gordon to assist him as much as they can, to fight against the Overwatch.
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