Although originally aired as a one-hour series, each segment is set up to be aired as separate half-hour installments. 22 episodes were made with 2 segments in each episode that adds up to 44 segments with each segment lasting around 22 min.
You're traveling through another dimension, a dimension not only of sight and sound, but of mind. A journey into a wondrous land whose boundaries are that of imagination. You are entering the Twilight Zone.
The DVD release of the complete series (or "Season 1" as the packaging calls it) features a few changes to the opening title sequence. (1) The image of Rod Serling on the gallery wall was replaced with a spiral vortex. (2) The theme song has been changed from a piece that barely sounds like the original 1959 series theme to a piece that sounds exactly like the original theme. Consequently, the credit "Twilight Zone Theme Music Adapted by Don Harper" in the end credits has been removed on the DVD.