Place it at the very start of an edit as the call to begin, then follow it with the Inception Horn for a bigger entrance to mark the opening scene. For a lighter game-night opening, put Okay Let's Go after it so the group moves from the summons straight into play.
About this sound
The clip is the G-Man speaking the Russian line 'Vremya, Doktor Freeman' in a slow, calm voice stretched with long pauses, lasting about 7.6 seconds. It feels quietly unsettling rather than loud, as if someone patient and powerful has been watching and is now calling the listener to begin. It comes from Half-Life 2, where the suited figure wakes Gordon Freeman from stasis to start a new job.