"Opening narration" refers to the beginning part of a story or show where a voice-over talks and introduces the audience to the characters, setting, or plot, providing a brief overview or background information. Full definition
Opening narration claims we must go back to the beginning to a time when enemies once were friends. (dvdizzy.com)
The city, which is credited in opening narration by the shop's proprietor (Cube) for giving us Michael Jordan's Bulls and Oprah Winfrey, is going through some troubles due to intense gang warfare. (dvdizzy.com)
Purchasers of the Milan edition have the added feature — again, whether it's a strength or a weakness is debatable — of hearing the classic opening narration by Mako. (soundtrack.net)