IGN talks with Eric Johnson of Valve about their upcoming first-person shooter, Half-Life 2: Episode One. Talk goes over City 17, the relationship with G-man, Alyx as your buddy, and more.

IGNPC: We’ve seen some screenshots with different types of creatures and the Episode One trailer mentioned stalkers a bit. What are these guys? Can we expect to see new enemy types in most of the episodes in the future?

Erik Johnson: Stalkers are the result of how the Combine dealt with the residents of City 17 that resisted them. Each Episode will be introducing you to more of the Combine.