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Star Trek: Hidden Frontier (HF) is a Star Trek fan film project. Produced on digital video, the show's sets are almost completely virtual, using a green screen chroma keyed process to place performers into virtual settings. The series is set after the era of the Star Trek: Deep Space Nine and Star Trek: Voyager series. In universe, it is set in the aftermath of the Dominion War. Episodes revolve around the starship USS Excelsior, and its home base, Deep Space 12, which is located in the Briar Patch, a region of space introduced in the film Star Trek: Insurrection. Hidden Frontier has produced 50 episodes, and focuses on character relationships, including gay and lesbian characters and subplots. Produced by Rob Caves, Hidden Frontier ran for seven seasons and was produced by volunteers in Southern California. The final episode of the series aired in May 2007. Two new spin offs, Star Trek: Odyssey and Star Trek: The Helena Chronicles, also produced by Rob Caves, take place shortly after the end of Hidden Frontier.

Based in the Briar Patch (Tikrit Expanse) introduced in Star Trek: Insurrection, on Deep Space 12, a space station in orbit of the planet Ba'ku. It follows the daily life of several officers serving on board the station and a few of the ships stationed there. Early in the series, an advanced species, the Grey, are introduced and become the primary villain, with a story arc that spans the entire series. Later, secondary villains are introduced including an Andorian trader and later the Tholians along with a man named Siroc. Mysterious ancient alien artifacts become a key focus of the series. The crew interacts with many established species from Star Trek, including Andorians, Ba'ku, Klingons, Romulans, Son'a, and Tzenkethi.

Character Actor(s) Rank Position Ian Quincy Knapp David Dial Rear Admiral Commanding Officer of Deep Space 12 (former Commanding Officer, USS Excelsior) Elizabeth Shelby Risha Denney Captain Commanding Officer (former executive officer), USS Excelsior Tolian Naros Larry LaVerne Captain Commanding Officer, USS Helena (formerly executive officer, USS Excelsior) Dr. Henglaar John Whiting Lieutenant Commander Chief Medical Officer, USS Excelsior Robin Lefler Kelly Jamison, Joanne Busch Commander Executive Officer (former chief engineer), USS Excelsior Matt McCabe Wayne Webb Lieutenant Tactical Officer/Security Chief, USS Excelsior Myra Elbrey Barbara Clifford Lieutenant Commander Counselor, USS Excelsior Ro Nevin Arthur Bosserman, Bobby Quinn Rice Lieutenant Chief Science Officer, USS Excelsior Corey Aster J. T. Tepnapa Lieutenant Commander Chief Engineer (former Assistant Chief Engineer), USS Excelsior Jorian Zen/Dao Adam Browne Lieutenant Tactical Officer, USS Helena (former Helmsman, USS Excelsior)

Star Trek: Hidden Frontier premiered in 2000, an offshoot of the fan series Voyages of the USS Angeles, produced by the Star Trek fan club of the same name in Southern California. For legal reasons, copies are limited to the cast and crew. No earlier series episodes are available to the public and no reference to the show is made on the club's web site. Hidden Frontier inherited the setting, Deep Space 12, and several of the characters from the Angeles series, however it established its own identity. Two later HF episodes made usage of footage originally shot for Angeles that were never produced. Due to production expense, the series is filmed in the executive producer's home utilizing a green screen matting technique to place actors into "virtual" sets. Often, a slight green halo appears around the actors, which some viewers decry. While technique and technical standpoints of the show may not be as advanced as other fan films, it shows progress in the milieu. This amateur web based series contains a multi arc plot, producing at least six episodes per year. Other productions are often one offs or released at a much slower rate. Most episodes are released in low resolution due to potential legal issues. Currently, only five (originally six) episodes have been released in high quality: A special edition of Season 1's fourth episode, "Two Hours", Season 6's premiere and finale, "Countermeasures", "Her Battle Lanterns Lit" (released in both low and high resolutions, modified into a single regular episode), Season 7's premiere, "Heavy Losses", and the two part series finale. Several key roles had replacements during the seven year run. The character of Lefler was originally played by Kelly Jamison, later portrayed by Joanne Busch. The character of Ro Nevin was originally played by Arthur Bosserman who left the cast after five seasons to pursue professional interests in music. This role was resumed by Bobby Rice. For Seasons 2 and 3, nine episodes were produced each. The later seasons were reduced to six episodes, as nine were too much work for the volunteer cast and crew. Season 7, the final season, consists of eight episodes. In Season 6, a short fan fic author Steve Berman writings were adapted for a memorable scene in episode "Vigil". Hidden Frontiers theme music is taken from the film Galaxy Quest. Because of the crew's short production schedule and low budget, the music for most of HF's episodes was inherited from Paramount owned soundtracks (both Star Trek and non Star Trek), thus confining potential copyright issues to a single studio. Original scores were created for the last four episodes, when several composer fans of the series volunteered to create the music.

Elizabeth Shelby appeared in the TNG two part story "The Best Of Both Worlds". She was also featured in the novel series Star Trek: New Frontier. Robin Lefler appeared in TNG episodes "Darmok" and "The Game". She was also featured in New Frontier. Ro Nevin is the brother of Ro Laren, who left Starfleet to join the Maquis. Captain Mackenzie Calhoun from New Frontier appears in "Vigil" portrayed by James Cawley. His ship, the USS Excalibur, appears briefly in "Perihelion" and "Vigil". Captain Hikaru Sulu and the USS Excelsior appear in "Yesterday's Excelsior". Wesley Crusher appears in "Echoes". The USS Defiant featured in the TOS episode "The Tholian Web" and Enterprise two part story "In a Mirror, Darkly" appears in "Voyage Of The Defiant". Artim Ibanya was introduced in Star Trek: Insurrection. Corey Aster is the cousin of Jeremy Aster, who appeared in the TNG episode "The Bonding". Alynna Nechayev made four appearances in TNG, and two appearances in DS9. Kira Nerys appears in "Countermeasures". Maya Stadi is the sister of Lieutenant Stadi who appeared the Star Trek: Voyagers premiere episode “Caretaker”.

The series was mentioned by several journalists and news outlets.