Place it as the closing line of a build-up, after a tense cue such as Imperial March, then follow it with Law and Order Dun Dun to seal the reveal. Keep it as the last spoken beat before the title card, and avoid stacking another vocal line straight after it.
About this sound
This clip is a brief sung phrase lasting about four seconds, with a clear voice carrying the line 'Tomorrow belongs to me' in a firm, determined delivery. It feels bold and unsettling at once, confident on the surface but carrying a darker edge underneath. That mix makes it land as a dramatic declaration rather than a casual lyric.