The CBS Video Library produced a series of The Twilight Zone (Original Series) video cassettes exclusively available through a mail-order service, later distributed through Columbia House. For the fee of $29.95 (following an introductory volume at $9.95), subscribers would receive a cassette each month. Each cassette typically featured four half-hour episodes from the series, though some contained three (usually containing one of the hour-long episodes from Season 4) or, rarely, only two. Perhaps for this reason, the videos presented the episodes out of chronological order, by either production date or air date.