Footage created by Industrial Light and Magic for Star Trek: First Contact) showing the launch of Cochrane's ship, the Phoenix, is included in the opening credits.

The opening credits includes the rolling-out of the space shuttle Enterprise which was attended by Gene Roddenberry and the cast of Star Trek - The Original Series because it was named after Kirk's Enterprise NCC-1701 after NASA received thousands of letters from Star Trek fans. Footage of a Saturn V rocket lifting off reused from "Assignment: Earth".

A small statue of a man pointing up is often seen in Archer's quarters, and in "Twilight", is even used as a weapon. This statue is of human warp drive creator Zephram Cochrane, and appears to be a miniature version of a statue described in Star Trek - First Contact.

In "Twilight", T'Pol tells the amnesiac Archer that they are "...on the fifth planet of the Ceti Alpha system." This is the same planet on which Captain Kirk left Khan Noonien Singh in Star Trek: The Original Series episode "Space Seed". At that point, Ceti Alpha V is described as harsh and inhospitable but survivable. Despite the fact that the landscape seen through the windows in "Twilight" seems to be not only congenial but even pleasant, as opposed to merely survivable, this is consistent with what is learned of the Ceti Alpha system in Star Trek - The Wrath of Khan. In the film, Khan states that Ceti Alpha V was turned into a wasteland by the explosion of Ceti Alpha VI, which altered the orbit of Ceti Alpha V. Planets don't typically explode for no reason - it is likely that there was an ongoing problem with VI that turned V from the paradise we see in "Twilight", to the "harsh but survivable" world described in "Space Seed", to the wasteland seen and described in "The Wrath of Khan".

The Inspection Pod in "Broken Bow", is actually a minor redesign of the cockpit section of Zefram Cochrane's Phoenix from Star Trek: First Contact.

This series did not use the traditional sound stages reserved for Star Trek series, because one of the stages, which last held the Star Trek: Voyager sets, was demolished following filming of the last Voyager episode.

During the third season, for the first time since the original Star Trek: The Original Series, a Trek series faced the real danger of cancellation by its network. But just as TOS was saved from cancellation, a massive letter-writing campaign by fans led to the show being renewed for a fourth season in May 2004 - with the head of UPN acknowledging that the campaign was instrumental in the decision to save the show from cancellation. Unfortunately the series was canceled following the fourth season. It is the only other Star Trek to be canceled in the middle of its run.

Majel Barrett, Joseph Ruskin, Clint Howard and Jack Donner are the only actors to appear in both this series and the original Star Trek: The Original Series.

Clint Howard played "Muk" in episode "Acquisition". He also appeared in Star Trek: The Original Series playing "Balok" in "The Corbomite Maneuver" and as a Human character in “Star Trek: Deep Space Nine” playing "Grady" in “Past Tense (Part 2).

This was the first Star Trek series to have an actual theme song, a fact that caused controversy among fans, who were split on the idea. The pilot episode used a different piece of music for the closing credits (in fact, an instrumental of the opening song) from the rest of the episodes. Beginning with the third season, the theme was revised to be more upbeat.

It is revealed in "Zero Hour", that the founding members of the United Federation of Planets are Humans, Vulcans, Andorians and Tellarites.

Jeffrey Combs (Shran/Krem), Gary Graham (Vulcan Ambassador Soval) and Matt Winston (Crewman Daniels) are the only actors, besides the regulars, to appear in all four seasons.

The first Star Trek series to not use "starring" and "also starring" in the credits; also the first to not name the characters being played by the actors.

The solar system in the title sequence is described in German.

This is the only "Star Trek" series to have the same regular cast throughout its entire run.

The two-part episode "In a Mirror, Darkly" takes place within the "Mirror Universe" from the "Mirror, Mirror" episode of the original Star Trek: The Original Series. The cast play their mirror counterparts only... making this the first Star Trek episode to not feature any regular characters.

The Defiant's computer in "In a Mirror Darkly, Part II" is voiced by Majel Barrett, making her the only actress to have appeared in every Star Trek series.

Scott Bakula's co-star Dean Stockwell from Quantum Leap guest-starred in "Detained". Stockwell's Enterprise character carried a hand-held computing device similar in appearance and sound effects to the one his Quantum Leap character did throughout the series.

In “United", T'Pol tells Captain Archer there is an old Vulcan saying, "One man can summon the future". This is a nod to the original series "Mirror, Mirror", in which the "evil universe" Spock tells Captain Kirk the Mirror-Vulcan saying "One man cannot summon the future".

Episode "North Star", originally broadcast in the US on 12 November 2003, was the first episode of any Star Trek series to carry a TV-14 rating (for violence.)

Trek semi-regulars Foundation Imaging (a company which had been working in special effects since its involvement in the first season of sci-fi series Babylon 5), was dropped on the debut of Enterprise's second season. Instead Eden FX took over all the effects work to become the new leading effects house for the TV series.

Up to this series, the pilot of each Star Trek series after the first included a cameo of a character from the previous one. However, because "Enterprise" takes place 100 years before the original Star Trek, the cameo was not of a series character, but of Zefram Cochrane (James Cromwell), who appeared in Star Trek: First Contact and in the original series episode “Metamorphosis" portrayed by Glenn Corbett'.

Longtime Trek actor Vaughn Armstrong (famous for his many alien roles on various Trek series) appears here as a human for the first time. His character, Admiral Maxwell Forrest, is the commander-in-chief of the fledgling Starfleet.

Admiral Forest is named after DeForest Kelley, the late Star Trek: The Original Series actor who played Leonard H. McCoy. Similarly, Commander Williams and Admiral Leonard from "Broken Bow" are named after series stars William Shatner (James T. Kirk) and Leonard Nimoy (Spock).

One of the augments in "Borderland" is named Persis. This is a tribute to the late Persis Khambatta who played Lt. Ilia in Star Trek: The Motion Picture. She died of a heart attack 18 August 1998.

The first name of Captain Archer was initially to have been Jeffrey. While the (American) producers of the show didn't see any problems with this name, UK fans pointed out the link to disgraced author, actor and politician Jeffrey Archer after learning of the name over the Internet. The name was changed to Jackson, but there was exactly one person in the country named Jackson Archer. To avoid lawsuits, Jonathan was chosen for a name because there were 20 Jonathan Archers.

The series has established an annual tradition of featuring crew members from the real-life aircraft carrier USS Enterprise (CVN-65) in cameo roles. This first happened in "Desert Crossing", and continued in "First Flight". As a courtesy, advance copies of first-season episodes were sent to the carrier.

Scott Bakula jokingly suggested prior to the filming of the two-hour premiere that Captain Jonathan Archer's middle name might be Beckett, a reference to his previous television series, Quantum Leap, in which his character was Dr. Sam Beckett.

It had been reported that NBC, the network that carried the original Star Trek: The Original Series, was interested in acquiring this series, but lost out to UPN.

During filming of the pilot, veteran Star Trek actors Brent Spiner and Jonathan Frakes visited Scott Bakula on the set to give him advice about what to expect while working on the series.

"Star Trek" was originally left off the title because of its overuse in previous franchise titles and because "Enterprise" was just as instantly recognizable, from "Broken Bow", all the way through to "Anomaly". After the second season suffered low ratings, the third season adopted the title "Star Trek: Enterprise" starting with "Extinction". When "The Xindi", re-aired "Star Trek" was added to the title. However, in re-airing "Anomaly", the title remained simply "Enterprise".

The interiors were inspired by a visit to a docked nuclear submarine.

The bridge set has 80 plasma screens built into it.

Dominic Keating was denied a callback for a guest shot on Star Trek: Voyager because Rick Berman wanted him for this.

Mayweather was originally going to be a lieutenant because of his extensive space experience, but was made an ensign due to the age disparity between him and Reed.

Connor Trinneer discovered a lot of his friends were closet Trekkies when he got his role.

Based on the official Star Trek Chronology, the series begins 10 years prior to the founding of the United Federation of Planets and 90 years after the events of Star Trek: First Contact. Episode one takes place approximately 115 years prior to the start of Star Trek: The Original Series and 213 years before Star Trek: The Next Generation.

Because the show is 100 years before Kirk, some old technology has reappeared:

• flip-open communicators
• manual sliders on the transporter
• the science station viewfinder
• Most of the sound effects for the Enterprise come from original 1960s Star Trek series - including all the bridge sounds, doors, communicator chirps, and most of the panel sounds. Instead of shields, the Enterprise has polarized hull plating and instead of hand-held phasers, the crew are introduced to phase pistols. There are no photon torpedoes, simply torpedoes. The transporter has only recently been approved for transporting bio-matter (people)...and no one on the crew trusts it. It has 4 docking doors for shuttlepods. The design of 22nd century Enterprise NX-01 bears a striking resemblance to the 24th century Akira Class starship, first introduced in Star Trek : First Contact. Enterprise carries a designation of NX-01 which, according to established canon, indicates a prototype starship. It also indicates the first Starfleet starship to use this naming convention. Enterprise is the first Starfleet vessel to use the new warp 5 engine developed by Zefram Cochrane and Jonathan Archer's father, Henry.

Enterprise is the first "Star Trek" series to be shot in widescreen format, to allow for HDTV format airing. Enterprise is only the third Star Trek series in the franchise's history to have a September premiere date, and the first Star Trek series in fifteen years to premiere in September. The original Star Trek: The Original Series and Star Trek: The Next Generation both premiered in September. “Star Trek: Deep Space Nine” and Star Trek: Voyager both premiered in January.

Originally Jolene Blalock's character of T'Pol was supposed to be called T'Pau. The character appears in an episode of Star Trek. They changed it at the last minute because if they used the character of T'Pau, they would have to pay royalties to the writer of the original Star Trek episode that she appeared in every time T'Pau was used. Which would mean that they would have to pay a royalty for every episode of "Enterprise." Incidentally, the character of T'Pau later made an appearance in the three episodes of the Vulcan renaissance story arc in season 4.

The Chief Medical Officer of the Enterprise is Doctor Phlox. The name Phlox was a character of the Hierarchy race from Star Trek - Voyager "Tinker, Tenor, Doctor Spy". However, the name of the character in the Voyager episode was only used in the script and was never mentioned on screen.

The three Starfleet officers in the sickbay scene in "Broken Bow", are named after the leads in the original Star Trek: Commander Williams ('Jim Fitzpatrick' for William Shatner), Admirl Dniel Leonard (Jim Beaver for Leonard Nimoy) and Admiral Maxwell Forrest (Vaughn Armstrong for DeForest Kelley).

In Capt. Archer's cabin, there is a photo on the wall of a Pan American World Airways Boeing Clipper. Gene Roddenberry was, at one time a pilot for Pan Am.

In his speech in the first episode, Zefram Cochrane says, "...to go boldly where no man has gone before," thereby robbing tiresome individuals everywhere of the chance to pointlessly pontificate about split infinitives.

According to Jolene Blalock, a decision was made to change T'Pol's make-up - particularly her hairstyle - after three days of shooting. All Blalock's scenes for the first few days had to be reshot.

During its first run it was the most special effects-laden television show on the networks, with a reported 2,700 effects shots in the first season alone. Roughly 300 in the two hour pilot and an average of 100 per episode. Season Two surpassed this number with a reported 2,900 visual effect. The average budget for each episode of Enterprise in its first season was $3,500,000. Due to both the success of the show and more creative technology required for further seasons, the budget was increased to $5,000,000 starting with "Shockwave Part II".

John Shiban, who previously had a long career on the The X Files, was brought on as writer and producer of Enterprise for its second season. The first episode he wrote "Minefield", and tackled a sensitive subject in the world of Trek continuity, the Romulans. Despite fears, the episode was raved by critics and fans accepted the complicated continuity as a result.

Creator Rick Berman has said that the Suliban were named after the Taliban (they were named long before September 2001).

Commander Tucker's nickname was originally to be "Spike". His eventual nickname 'Trip' comes from his being the third generation man of his family to be called Charles. Trip is short for triple.

After the space shuttle Columbia disaster on 1 February 2003, last-minute editing on "Canamar", (broadcast 26 February 2003) was done to remove a shot of a spaceship exploding as it enters a planet's atmosphere.

In the show's opening credits, there is a "mystery ship" that appears between the the shot of Zefram Cochrane's Phoenix and Captain Archer's Enterprise. The mystery ship has a more primitive layout than the Enterprise, and huge blue impulse engines. This ship has never been named, and no explanation has been given as to what its function is, although some fans speculate that it may be the S.S. Valiant mentioned in the original series episode 1.3, "Where No Man Has Gone Before".

The American astronaut shown in the opening credits is Alan Shepard, the first American astronaut in space, and later commander of Apollo 14. There is also archive footage of: Charles A. Lindbergh next to his plane Spirit of St. Louis, Robert H. Goddard the father of modern rocketry writing his theories on a blackboard, Chuck Yeager and the Bell X-1 with which he broke the sound barrier and astronauts Neil Armstrong, Buzz Aldrin and Michael Collins as they board Apollo 11 to become the first men on the moon.

In "Dead Stop", the voice of the repair station computer is the director of the episode, Roxann Dawson (B'Elanna Torres from Star Trek: Voyager).

In 2002, Viacom (owners of Paramount and "Enterprise") mandated that all its TV series would devote at least one episode to the subject of AIDS awareness. Enterprise's response, aired in early 2003, was "Stigma", in which T'Pol is revealed to have contracted an intimately-transmitted, incurable disease.

Malcolm Reed was originally written as a Major in the (rarely seen) Starfleet Marine Corps. Also, plans had been made to include at least one Starfleet Marine in all 'away missions' but this was also dropped.

At the end of the second season (May 2003), Paramount announced that "Enterprise" would undergo a major "redirection" in hopes of boosting ratings. The new 9/11-influenced story arc included a revival of the "Starfleet Marine Corps" idea. Major cosmetic changes for T'Pol (including a new hairstyle and wardrobe, and the introduction of more emotion into her character) and a revised version of the controversial theme song were also introduced.

Julia Rose, who has a recurring role as a space marine (MACO) in the 2003-2004 season, wears a uniform previously worn by Hilary Swank in The Core. According to a September 2003 interview with Rose, the uniform still has a label with Swank's name on it.

The advanced shuttle shown in Earth orbit in the opening credits bears the registry number "DV-169".

"Harbinger", contained the first Star Trek nude scene presented in a sexual context (an episode of TNG did show a nude woman, but it was in the context of an art class, and both Troi women, from the back). The episode aired in the United States on 11 February 2004 during the height of controversy over Janet Jackson exposing a breast during the Super Bowl halftime show, on a network owned by CBS (which was taking heat for the incident). As a result, the scene in which T'Pol's rear end is exposed was censored. Canadian broadcasts, however, were uncensored.

There are two animal actors who portray the character "Porthos" on this series. The two female beagles are named "Prada" and "Breezy", the latter being younger (Porthos is supposedly a male).

In "The Xindi", a villain is shown broadcasting a message to Enterprise. The prop used in this scene is a 1950s-vintage radio microphone.

T'Pol held the rank of Subcommander. This rank is traditionally associated with the Romulans; however, since the Romulans and Vulcans were originally one race, it would not be improbable for them to have similar terminology or military structures.

Although produced in widescreen since 2001 in anticipation of HDTV, actual broadcast of the series in HDTV by UPN did not begin until the fall of 2003, midway through season 3.

Filming of the pilot episode featured a scene in which Jolene Blalock, as T'Pol, bared her navel. This required removal of Blalock's navel piercing ring. According to interviews given by Blalock, the ring proved very difficult to remove, and forced Blalock (in full Vulcan make-up) to visit a nearby tattoo-body piercing shop to have it removed.

With the exception of a brief line in "The Augments", the ship is never referred to as "The Enterprise", but is always referred to as "Enterprise" without the definite article.

Several episodes feature clips from classic movies as the crew enjoys occasional "Movie Night" diversions. Most of the films that have been featured, such as For Whom the Bell Tolls and The Court Jester are, naturally, Paramount films (and Enterprise is produced by Paramount). However, one episode prominently featured footage from Frankenstein, a Universal Studios production. By using films from its own libraries, Paramount thus avoided having to pay royalties.

"Carbon Creek" included a reference to the TV series The Twilight Zone, in which William Shatner once guest starred. As it happened, the debut episode of a revived version of the series aired immediately after the Enterprise broadcast. It also features a joke involving the TV series I Love Lucy which was produced by Desilu - the company that produced Star Trek: The Original Series. Lucille Ball has also been credited with saving the original series from early cancellation. The episode includes a scene in which T'Pol's great-great-grandmother introduces Velcro to earth. One of the Vulcans involved is named Mestral, after the real-life inventor of Velcro, George de Mestral.

The Vulcan character "Tos" in the premier episode is an in-joke to Star Trek fans, as "TOS" is the common abbreviation for The Original Series.

In "Broken Bow", Tucker and Mayweather are discussing a planet inhabited by women with three breasts, a probable reference to Eccentrica Gallumbits, the Triple-Breasted Whore of Eroticon 6 in The Hitch Hiker's Guide to the Galaxy (where she is mentioned but never seen).

T'Pol's age became a matter of some debate among fans (and a minor running joke on the series itself) during the show's first 3 seasons. According to the original writers' "bible" for the series, she is 67 years old at the time of "Broken Bow", a fact confirmed by Jolene Blalock in interviews. In the season three finale, "Zero Hour", however, T'Pol revealed that she is actually 65 years old (and will turn 66 on her next birthday). It has been speculated that either the writers shaved a few years off her age (since bibles are only guidelines), make a mistake, or T'Pol is lying about her age and is really 70.

Malcolm Reed was named for a minor character in C.S. Forester's Horatio Hornblower books. Both characters were English and came from families that had generations of career Navy men, although Malcolm Reed in Enterprise was the first to join Starfleet.

T'Pol's eyebrows change appearance between the second and third seasons, becoming more arched and Vulcan-like. In a 2004 interview with Femme Fatales magazine, Jolene Blalock revealed that she and her makeup artist unilaterally decided to sneak a change in T'Pol's eyebrows amongst the character's pre-third season hairstyle and costume alterations, and no one from the production office complained.

It was widely rumored in the spring of 2004 that alternate endings for the third season finale were filmed. Scott Bakula went so far as to suggest on a major talk show that in one of the endings filmed -- to be broadcast if the series was cancelled - Archer died. Later, Bakula denied that any alternate endings were filmed, despite the fact that, had the series been cancelled at the end of season 3, it would have ended with a cliffhanger.

The Enterprise's sister ship (the NX-02, seen under construction in the episode "The Expanse") was finally given a name, Columbia, towards the end of the third season. The ship was named after the space shuttle Columbia, in honor of its late crew. This leads some to speculate that all NX-class ships will be named after space shuttles, because this is actually also the order in which the orbiter fleet was built. Enterprise came first, as a test vehicle not flown in space, then Columbia. In the order they were produced, the orbital vehicles (popularly known as spaceshuttles) made after the first two were Challenger, Discovery, Atlantis, and Endeavour (built to replace the loss of the Challenger). With NX-01being Enterprise, NX-02 Columbia, it is within reason that NX-03 will be Challenger, NX-04 Discovery, NX-05 Atlantis, and NX-06 Endeavour.

Beginning with "Storm Front: Part 1", the series is shot with digital cameras rather than on traditional film.

Out of all the main Xindi characters, the Xindi-Humanoid (played by Tucker Smallwood) was the only one whose real name we never learned.

The 'Star Trek Crews' from all the Star Trek series were ranked 2 in TV Guide's list of the "25 Greatest Sci-Fi Legends" (1 August 2004 issue).

According to Mike Sussman, an uncredited Brannon Braga actually wrote half of "Anomaly", particularly the airlock scene.

Anthony Montgomery (Travis Mayweather) once auditioned for two different roles on Star Trek: Voyager, one of which was Tuvok's son Sek. Montgomery was the last actor to read for the role of Mayweather.

Ben Browder was considered for the role of Major Hayes.

It was during the shooting of the fourth season episode "In a Mirror Darkly" that the cast was informed that the series had been canceled.

The device that Malcolm Reed uses to erect a forcefield in "Vox Sola", consists partly of several earpieces as used by Lt. Uhura in the original Star Trek -The Original Series.

The ship's cook, referred to as Chef, is mentioned throughout all seasons, but as part of a running joke, he is never seen. He makes a small appearance in "The Catwalk", but he doesn't speak and is filmed from the waist down. Part of the reason for eluding him is out of respect for food stylist, Dorothy Duder, who makes all the show's food props and is therefore considered the "real" Chef.

Trivia items below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.

In the final episode, Riker is reviewing the crew list for the Pegasus. The names and Photos used are those of the Production Crew (Ron Moore, Dawn Velasquez, etc.)

In its final episode "These Are The Voyages..." the star date given (47457.1) is the same as the star date used for "The Pegasus" in Star Trek: The Next Generation's final season.

The scene where we see some interior of the Enterprise D is taken from Star Trek: The Next Generation episode "Menage a Troi". Lwaxana Troi is substituted by William T. Riker in this scene, which is why he can be seen twice.

Anachronism: In "Carbon Creek" which takes place sometime after September of 1959 (as evidenced by a reference to "The Twilight Zone" (1959), new twenty dollar bills are visible when the tip jar is seen overflowing with cash.

Continuity Error: In thir"Zero Hour", T'Pol's log entry says the year is 2152. However, "Countdown", established that the year is 2154.

Anachronism: In "Storm Front", Trip, while locked in a room, climbs up to break a light bulb. The light switch and electrical outlet are visible. It is a three prong grounded outlet, which were not yet in use during the time frame of the episode.

Continuity Error: In "In a Mirror, Darkly, Part II", the Defiant fires on the Avenger, blowing a hole in the saucer section. Several seconds later, when the Defiant is shown in a close-up returning fire, the saucer section has no damage.

Continuity Error: In "Divergence" and "Bound", Trip Tucker is supposed to be stationed aboard the NX-02, Columbia, but in several scenes, he can be seen wearing Enterprise's patch, not Columbia's.

The opening title sequence, which chronicles humanity's progress towards the stars interspersed with other vessels named Enterprise, features footage from Star Trek: First Contact of the Phoenix, humanity's first FTL spacecraft, separating from its booster rocket and deploying its warp nacelles.

The opening credits montage contains archive footage of famed pioneers of air and space, including Amelia Earhart, Chuck Yeager, Alan Shepard and Buzz Aldrin (or at least his boot).

Before the opening credits of the episode "Stigma" (original airdate 5 February 2003) a tribute to the crew of the space shuttle Columbia (deceased 1 February 2003) states  "To the crew of the space shuttle Columbia, you continue to be our inspiration."

The closing credits of the first episode, "Broken Bow," uses a unique guitar instrumental version of the show's opening theme song, which has not been used in any further episode of the series.

Opening credits are in alphabetical order. Fortunately, the name of series star Scott Bakula comes earlier in the alphabet than the others, so his name is still top-billed.

The episode "In A Mirror, Darkly" features a completely different title sequence, charting the warfare-laden progress of the Terran Empire into space

The opening credits for the two-part episode "In A Mirror, Darkly" depict what the opening credits might have been had the show aired in the "Mirror Universe" in which the episode was set.

The DVD release of Season 3 modifies the opening credits of the first three episodes of the season to say "Star Trek: Enterprise" instead of "Enterprise", in order to be consistent with the rest of the season.

North American syndicated version of the first episode "Broken Bow" replaces the instrumental version of "Faith of the Heart" with the instrumental "Archer's Theme" heard on most other episodes.

The music tracks from the following scenes were scored differently from internet clips released a few days before the premiere and the final version:

• the Opening Scene in the cornfield
• the Sickbay Assault

The premiere episode, Broken Bow, originally aired as a two-hour TV movie. As has been the case with past Trek two-hour specials, minor edits are expected when the episode is syndicated as a two-parter.

The Canadian cable network Space Channel uses a different version of the closing credits. While the regular closing consists of white text on a black background, the Space broadcasts fills the top half of the screen with a picture of Earth with the Enterprise logo superimposed over it, with the credits condensed onto the lower half of the screen.

There are two versions of episode "Shockwave Part 2". It originally aired on 18-Sep-2002, but when it reaired in its first rerun on 23-Oct-2002, it was an 'extended version', with about 1-minute 4-seconds of added footage!

The Season 1 DVD release in May 2005 included several minutes of deleted scenes for several episodes. Most of these were obvious trims for time or pacing, but a couple of more substantial cuts are also included, such as a scene from "Two Days Two Nights" showing how Archer arranged for his crew to take shore leave on Risa (including a line of dialogue from T'Pol that foreshadows the following season's episode "The Seventh").

Two versions of the third season episode, "Harbinger" were broadcast. As originally filmed, a love scene between T'Pol and Trip included a brief view of T'Pol's backside. When UPN aired the episode in February 2004, however, the shot was censored (although it was visible in trailers for the episode). Canadian broadcasts of the episode, however, were uncensored. The DVD version of this scene is uncut.

Region 1 DVD release of the second season omits the tribute to the crew of the Space Shuttle Columbia originally aired at the start of the episode "Stigma".