Put it at the very start of a reveal, just as the character steps into frame, then follow with the Inception Horn Sound Effect for scale before cutting to the action. For a raid-style entrance, pair it with FBI Open Up Sound straight after the announcement.
Über diesen Sound
A clipped computer voice states that Gordon Freeman is here, delivering the name in short, flat bursts like a facility loudspeaker paging a staff member. It feels deadpan and faintly menacing, funny because the hero it names almost never speaks. The style comes from the VOX system in the original Half-Life from 1998, though this exact line may have been assembled by fans.