Depende. De acordo com as narrativas de abertura da série clássica, havia várias maneiras de identificar se você estava na zona de Crepúsculo,
Season 1 - [If] you've entered a dimension not only of sight and sound but of mind. A journey into a wondrous land of imagination then you're in the Twilight Zone.
Season 3 - if you see a "signpost up ahead — your next stop is the Twilight Zone!"
Season 4 - "[If] You're moving into a land of both shadow and substance, of things and ideas then you're in the Twilight Zone.
Seasons 3&4 "If you unlock a door with the key of imagination then you're in the Twilight Zone"