Trek: The Next Generation was halted in the early 1990s. LaserDisc Paramount published all episodes on the LaserDisc format from October 1991 using an extended release schedule that concluded in May 1999. Each disc featured two episodes with Closed Captions, Digital Audio, and CX encoding. Also published were four themed "collections", or boxed sets, of related episodes. These included The Borg Collective, The Q Continuum, Worf: Return to Grace, and The Captains Collection. For example, the "Q Continuum" collection of LaserDisc featured 4 episodes. The collection was released on July 30, 1997 and was published by Paramount Home Video; it retailed for US$99.98. The set included the 2-part "Encounter at Farpoint", "Hide & Q", "Q Who?", and "Deja Q" on 12 inch optical discs in NTSC format with a total runtime of 230 minutes, with stereo sound. The collection came in a Tri-Fold jacket that also included a letter from actor Jon De Lancie (Q). There was a production error with episode 166, "Sub Rosa", where a faulty master tape was used that was missing 4½ minutes of footage. Though a new master copy of the episode was obtained, no corrected pressing of this disc was issued. Star Trek: The Next Generation was also released on LaserDisc in the non-US markets Japan and Europe. In Japan, all episodes were released in a series of 14 boxed sets (two boxed sets per season), and as with the US releases were in the NTSC format and ordered by production code. The European laserdiscs were released in the PAL format and included the ten two-part telemovies as well as a disc featuring the episodes Yesterday's Enterprise and Cause And Effect. The pilot episode, Encounter At Farpoint, was also included in a boxed set called Star Trek: The Pilots featuring the pilot episodes from Star Trek: The Original Series, Star Trek: The Next Generation, Star Trek: Deep Space Nine, and Star Trek: Voyager. DVD The first season of the series was released on DVD in March 2002. Throughout the year the next six seasons were released at various times on DVD, with the seventh season being released in December 2002. To commemorate the 20th anniversary of the series, CBS Home Entertainment and Paramount Home Entertainment released Star Trek: The Next Generation – The Complete Series on October 2, 2007. The DVD box set contains 49 discs. Between March 2006 and September 2008, "Fan Collective"