Jackson is Doctor Kleiner's goofy assistant who always sees the best in things, even in the darkest of times.

Dallas is the serious, fast talking, optimistic cousin of Jackson. He's always been listening to Jackson's stories about Gordon Freeman, and has always wanted to meet him.

Gaybriel is a strange man who has a grudge against Jackson, and is always talking about a his plan to aquire a thing called "The Half Life".