Acting in the Dark: J. Michael Straczynski mapped out the entire five-season run of the show but didn't tell the actors what would happen to their characters down the road; they would only know once the episode scripts were given to them. This was to make the journey the individual characters went on feel more authentic. This is why Peter Jurasik (Londo) gushes about his character arc in the featurettes.
Actor-Shared Background: Jerry Doyle was an alcoholic in his youth, and the lingering effects killed him at age 60, decades after he'd quit. He's the reason why Garibaldi falling off the wagon was a big plot thread in Season 5, as he did not wish to risk downplaying how destructive the illness is.
Author Phobia: Londo's premonition of standing on his homeworld and watching the sky slowly fill with the Shadow vessels was based on one of JMS' recurring nightmares. He was curious to see if other people would find it as haunting as he did.
The widow of Gene Roddenberry, Majel Barrett, guest-starred in the third season as Lady Morella, the third wife of the late Centauri Emperor, as a means to quell the fan-anger between the shows. She'd previously been one of the biggest Trekkies to promote the show, urging fans at conventions to check it out.
Back when nearly all of the World Wide Web could be linked to one page, it seemed that most web sites had some sort of sci-fi series tribute somewhere. TNG was a popular choice for enshrinement. B5 has one up on them, though: the NCSA Mosaic browser (a distant ancestor of Internet Explorer and Firefox) had a semi-secret page where the developers expressed their love for B5 and provided a few links to fansites in case you wanted to learn more.
Black Sheep Hit: Notably, around the end of Season 2, the network notes ceased. The studio just stopped sending suggestions and demands, apparently content with JMS doing his thing or just ignoring him completely. This may have had something to do with PTEN's decay from an "aspiring fifth network" to nickname for the WB syndication package.
Cast the Runner-Up: Caitlin Brown (Na'toth) unsuccessfully auditioned for the part of Delenn in the pilot and Ivanova in the series.
Michael O'Hare (Sinclair) had a schizophrenic breakdown, but this was not known by the public or his castmates until JMS revealed it following O'Hare's death.
Jeff Conaway (Zack) had drug problems that contributed to the pneumonia which ultimately killed him.
When asked about sequels, Straczynski was known to say that he didn't see how it would be possible "so long as Andreas Katsulas (G'Kar) and Richard Biggs (Dr. Franklin) remain dead." That said, he did The Lost Tales after their passing, and now with his Hollywood success, there seem to be very early feelers out about a real movie. He also noted that Ta'Lon, played by the still living Marshall Teague, is similar enough to G'Kar that he could be used for further stories. However, with Jerry Doyle's death in 2016, followed by Stephen Furst in 2017, this is looking less likely.
It was revealed after O'Hare's passing that he had been suffering from paranoid schizophrenia for the entirety of Season One, in no small part due to the stress of helming a new TV show. (He had a fairly-promising theater career before that.) According to JMS, O'Hare held the show up with his bare hands to ensure that the rest of the crew would have a job to go to. But he was in no shape to do it again in Season Two, so he was conspiculously written out off-screen.
By Season Five, JMS was exhausted and in poor health from years of overwork and an unhealthy work environment: an absurd amount of electromagnetic energy was being routed right into his office. An inspector later said that no amount of money could entice him to spend even an hour in the room where JMS had been laboring for years. The Myth Arc was noticably put on hold, especially early in the season as he struggled to adjust to the compressed plot lines.
In "Babylon Squared", Garibaldi insists upon accompanying Sinclair and company to investigate the time distortion. Sinclair shuts him down, saying it is unwise to have the entire command staff away from the station at such a critical moment; an obvious dig at Trek's tendency to have the most (or all) of the senior staff depart on "away missions." However, in the audio-commentaries for several episodes, JMS makes repeated excuses for what he terms "TV moments", such as when one of the command staff decides to go join a fighter squadron in combat in defiance of military doctrine and wisdom.
Ivanova protesting attempts to merchandise the Babylon project. The writer of that episode was Peter David, who is also a prolific writer for the Star TrekExpanded Universe, and who wasn't above taking the piss out of JMS while writing for Space Cases. David was surprised, however, when JMS announced his intention to keep the line intact. David's reply was, "You people really are dangerous over there."
Ivanova: This isn't some deep-space franchise; this station is about something!
Lennier: If I were holding anything back, I would tell you.
Of course, the shows shared quite a few writers, directors (including the son of Leonard Nimoy), and guest actors between them, with several B5 regulars/guest stars appearing in guest roles on Star Trek before and after B5's conclusion. There are more similarities and parallels between the shows in theme and naming: the Prussian-themed Centauri and Cardassians, the recently-freed Narns/Bajorans (the Narn are a mix of Klingon warrior poets and Bajoran holy rollers), the black-suited and jack-booted Psi Corps/Section 31, the opaque Vorlons/Prophets and their evil counterparts, the Shadows/Pah-Wraiths. Some characters have similar names: DS9's Dukat and B5's Dukhat; DS9's Leeta and B5's Lyta. The premises have a great deal in common (a traumatized veteran of a battle for humanity's survival takes command of a space station and learns he has an important role in the prophecies of an alien religion), as do the war arcs (a Centauri/Cardassian seeks to reverse the decline of his empire and improve his own career prospects by allying his people with malevolent aliens, which ultimately leads to his homeworld's devastation).
The punchline: in 1998, Peter Jurasik co-wrote Diplomatic Act, a novel wherein the lead character, an actor in a Star Trek knock-off, is kidnapped by aliens who think he is the genuine article. The book is similar to Galaxy Quest, which was released one year later.
In "Severed Dreams", we see an ISN Newscast get cut short when an explosion rocks the building. Debris can be seen landing on the news desk, with the anchors crying out in terror. The debris wasn't supposed to land that close to the actors.
Claudia Christian (Ivanova) broke her ankle during "The Geometry of Shadows" but, thanks to a hasty rewrite (Susan getting trampled by the Drazi), was able to work through it. Though she might have wished she hadn't, since filming the 'injury' scene aggravated her real-life injury, generating such a blood-curdling scream that it was rumored she actually broke her ankle on-camera.
Lyta's eyes turn black whenever she is using her telepathic powers against the Shadows (or even just to interface with their technology), which requires quite a bit of effort and strain from her. It is worth noting that the black contacts that Patricia Tallman had to wear to get this effect were by all accounts intensely uncomfortable.
"In the Shadow of Z'ha'dum" has a scene where Sheridan starts to apologize to Talia for exploiting her telepathy. She cuts him off by slapping him. According to both JMS and Bruce Boxleitner, Andrea Thompson got so worked up in preparation for that moment that she walloped him across the face. The reactions on the set were genuine.
In The Gathering, Takashima's dialog is clearly looped, but no one else's is. This is because PTEN balked and wanted a "softer" performance from their female lead. JMS was pissed, and it was a factor in Tamlyn Tomita's quick exit from the show.
The part of Lyta in the pilot movie was written specifically for Patricia Tallman by JMS, who is a huge geek for zombie films and loved her performance in the Night of the Living Dead remake. Tallman had unsuccessfully auditioned for other roles, including a Trek movie, and worked as a stuntwoman on numerous TNG episodes, and guest-starred in at least two of them. (In her book she humorously refers to them as "vagina forehead" and "Liza Minnelli with jaundice.") She was chomping at the bit for something bigger, so when JMS offered Tallman the role, she was ecstatic and promoted the show around-the-clock. PTEN nixed the character and replaced her with Talia before the series went to air. In hindsight, it's clear that few people involved in the production (including Adam Nimoy) trusted Tallman, a stuntperson, to convincingly act. Not one to take a network note in stride, JMS called Lyta back into action the minute Talia was written out.
Warner Bros.' bungling resulted in the show's already-dreary CGI being made even worse, which also killed the possibility of an HD Remaster.
WB weren't responsible for B5: WBTV's first-run syndication division was, and they were denied the credit (and the profits).
Fake Nationality: The Irish-American Jerry Doyle played the Italian-American Michael Garibaldi. He once quipped that he was "a Mick from Brooklyn playing a Wop from Mars." (He was canonically born in NYC but worked the Mars beat for many years.) Fun: Jerry Doyle was never an actor. He went to school for aerospace engineering. He just randomly decided to try a shot at acting and got cast in B5. (Of course he was in some small things prior, most hilariously as a Bruce Willis "Wannabe" in an episode of Moonlighting.) Garibaldi was Jerry Doyle, so he's not actually acting. He was just playing himself.
American actress Claudia Christian played the born-and-raised Russian Susan Ivanova. She barely has any accent beyond an occasional stilted speech pattern in early episodes. The In-Universe explanation is that she spent most of her life studying abroad so her mother could prevent the authorities from figuring that Susan was a latent telepath.
Beata Pozniak, who is Polish, plays Russian Consortium Senator Susanna Luchenko in "Rising Star". In an example of Realistic Diction Is Unrealistic, she used an authentic Russian accent, but viewers still complain that it sounds fake.
Follow-Up Failure: Crusade had its share of problems, but inciting laughter wasn't one of them. Fans still poke fun at Legend of the Rangers for the weapons officer and her CG 'gun turret.' Dance Dance Revolution is the best interface. (The original concept was a weapons chair which would have been more like The Last Starfighter.) The Hand is supposed to be older and worse than the Shadows and yet they're defeated by an obsolete flying brick with a mediocre crew. Twice. What happened to casting character actors? Never mind, this fella's got a leading man's chin.
The first and most famous is Jerry Doyle's feud with Michael O'Hare. Doyle inerpreted O'Hare's frequent outbursts and tendency to go off on strange tangents as prima-donna behavior, and often referred to him as "the whackjob" in public. When O'Hare left the series after season one, Doyle threatened to "kick the whackjob's ass" if they ever set foot in the same room again; true to his word, they never again appear onscreen together. We now know that O'Hare's odd behavior was due to his inability to tell reality and hallucination apart.
Claudia Christian and JMS had a falling-out after she opted not to return for Season 5. Claudia claimed he hit on her and she turned down his advances; Joe alleged that she was leveraging the future of the series for higher pay, which he alludes to in a Lower-Deck Episode when one character speculates out-loud that Ivanova quit over a salary dispute. It got ugly and played out in real-time on the internet, with both parties talking past other, rallying fanboys to their side, and pitting them against one another. Transcripts of the feud are available online.
Line to God: JMS was a frequent poster on the Usenet group rec.arts.tv.scifi.babylon5.moderated during the show's run, and would often answer questions about the B5 'verse posted to rec.arts.sci-fi.tv.babylon5.moderated. Numerous comments have long since been collected and preserved on the Lurker's Guide fan site, in the "jms speaks" sections under each episode's entry on the episode list.
Filming took place in a disused recycling plant and hot tub factory. Tallman admits it was kind of funny going back-and-forth from the glamorous Paramount Studios (where Trek is filmed) to the recycling plant. (But she can't help adding that some anonymous Paramount exec whispered to her, "I really like Babylon 5" before darting off.)
A British computing magazine did an extensive article on Babylon 5 and its use of Amiga/Video Toaster systems and Lightwave to generate the effects. The tagline for the article was "Star Wars effects on a Doctor Who Budget" (The article in question pre-dates the Doctor Who reboot; at the time everyone thought of Doctor Who as that show with the "rubber monsters" and "wobbly sets.") The Earthforce ships hold up okay (even if they look a little too spotless). And the CGI allows fighter craft to pull off 'realistic' combat manuvers, such as pivoting on their axis to shoot at pursuers, as well as long-range battles between cruisers.
The Lost Tales. Most of the episode is green-screened, and what few actual sets they use are barely-serviceable walls. Sheridan's half opens in the middle of a black void occupied only with a pair of chairs because the Minbari are "minimalists." Sure.
Delenn's mentor, Draal, is played by Louis Turenne in the two-parter "A Time in the Wilderness". In all of his subsequent appearances, he is played the hammy John Schuck. This is Hand Waved by explaining that Draal has age-regressed as a result of being linked to the Great Machine.
Apparently they had a terrible time keeping actresses around to play G'Kar's aide. His first one, Ko'Dath, disappears under mysterious circumstances because Mary Woronov had trouble with the makeup and prosthetics. The same problem drove away the original Na'Toth actress, Susan Kellerman. Julie Caitlin Brown powered through the entire first season before she, too, succumbed to makeup problems and quit. Her role was given to Mary Kay Adams, who was not up to the task at all. Finally, Na'Toth was written out of the story altogether: the character is presumed dead during the Narn-Centauri war, and later found by Londo and G'Kar in a prison cell on Centauri Prime in Season 5. For this appearance, she was once again played by Julie Caitlin Brown.
Tracy Scoggins was known for playing bombshells or the Lovable Sex Maniac Cat Grant on Lois & Clark. She is the last sitting commander on Babylon 5, a role which doesn't allow for much humor or fanservice (although we do see her crawling through ducts in a tank top at one point).
Post-Script Season: The show was originally plotted to have a five-season arc. When PTEN finally disintegrated and the show was not renewed for a fifth season, the fourth season was reworked to finish the arc. The show was subsequently granted a fifth season by TNT, but with almost all of its major plot threads resolved. The fifth season which resulted was noticeably boring and was composed partly of scripts that had been cut from earlier seasons for various reasons.
The Production Curse: Fans have been saddened and spooked by the number of actors in the show who have died relatively young.
JMS: It is another loss in a string of losses that I cannot understand. Of the main cast, we have lost Richard Biggs, Michael O'Hare, Andreas Katsulas, Jeff Conaway, and now Jerry Doyle, and I'm goddamned tired of it. So dear sweet universe, if you are paying attention in the vastness of interstellar space, take a moment from plotting the trajectory of comets and designing new DNA in farflung cosmos, and spare a thought for those who you have plucked so untimely from our ranks... and knock it off for a while. Because this isn't fair.
Richard Biggs (Dr. Stephen Franklin) died of a ruptured aorta in 2004 at a mere 44 years old.
Tim Choate (Zathras) died in a motorcycle accident later in 2004 aged 49.
Andreas Katsulas (G'Kar) died of lung cancer in 2006 aged 59.
Jeff Conaway (Zack Allan) died from drug-abuse-related illnesses in 2011 aged 60.
Michael O'Hare (Jeffrey Sinclair) died from a heart attack in 2012 aged 60. It was subsequently revealed, via pre-arrangement with him about what would happen on his death, that he had developed schizophrenia during the making of his season of the show and struggled with it for the rest of his life.
Turhan Bey died at the ripe old age of 90 in 2012.
Jerry Doyle (Michael Garibaldi) died from an alcoholism-related heart attack in 2016 aged 60.
Stephen Furst (Vir Kotto) died from diabetes complications in 2017 aged 63.
Promoted Fanboy: Jeff Conaway was a big supporter of the show pretty much from Day 1. According to other sources, Conaway had seen the show on TV and liked it so much that he started hanging around the set to watch it bring filmed. Tracy Scoggins (Lochley) is a science fiction geek and had been watching the show from the start.
Real-Life Relative: Anna Sheridan (played by Beth Toussaint) first appeared in a video to her sister-in-law, which was recorded prior to her disappearance. Toussaint wasn't available for the episode where Anna returns as a Shadow agent; Melissa Gilbert (Bruce Boxleitner's real-life spouse at the time) was cast in her place.
Romance on the Set: Jerry Doyle was also married to actress Andrea Thompson (Talia Winters) during season one, but between seasons one and two, the couple went through an extremely bitter and acrimonious divorce. The set afterwards was something of a minefield.
Science Marches On: In "Believers", Doctor Franklin wants to perform a surgery to remove a blockage in the lung of a sick alien boy. His parents object to cutting him open because it's against their religion. This probably would have kept the kid's parents from killing him afterwards due to their belief that the soul leaves the body if it is cut open. The operation Franklin performs on the child can now be done non-invasively, requiring no cutting of the body at all beyond hacking up the blockage to facilitate removal via an endoscope. Endoscopic surgery was commonplace in the 1990's when the show first aired. If anything, Franklin should have even more advanced techniques to work with, but then his whole arc would unravel; it sets up a major plot point for two later episodes, both involving this same species (who managed to develop interstellar travel but somehow neglected medicine).
Screwed by the Network: Par for the course for a '90s syndicated show, as local stations could (and did) pre-empt it. Claudia Christian joked that her friends assumed she was bullshitting when she claimed she was a TV regular, since Babylon 5 was often pre-empted by Clippers games in the Los Angeles area. Per JMS, the reason why no network reruns the show anymore (and why JMS hasn't been able to do anything B5 related in recent years) is due to unnamed executives at Warner Bros. Television nursing a grudge against him and the property for costing them money. (See Trivia/Crusade.)
Scully Box: JMS is a tall man, and by his own admission mostly cast tall actors. One exception: Walter Koenig (5′ 6″), who played Bester. In most scenes where he is shown arguing with the Babylon 5 personnel, the other actors remain seated in order to avoid looming over him in the shot.
Sleeper Hit: Despite its cult following, the series was not seen in reruns after it left the airwaves. It has found a new audience on Amazon Prime Video and with airings on Sinclair Broadcasting's Comet digital subchannel.
Spin-Off Cookbook: Dining on Babylon 5 by Stephen C. Smith. It actually appeared in the series. It's compiled by the owner of B5's Fresh Air Restaurant and with contributions from all the main station personnel (with a note explaining the alien recipes have been adjusted to suit human biology).
Spoiled by the Cast List: "A Tragedy of Telepaths" suffered from this. Julie Caitlin Brown's name appears in the guest cast list, spoiling the episode's revelation that her presumed-dead-for-two-seasons character Na'Toth is still alive.
The thick digital tablets used by the station personnel might have looked futuristic ...in the mid-90's when the show was produced. Also, the snowy static shown on a monitor whenever a camera is shot out is jarring if you are used to modern devices that simply switch to a blank black or blue screen when the signal is lost.
Then there are the computer interfaces. The buttons look like colorful candy, and the interfaces look like a children's computer game from the 80's.
Data crystals. Small clear crystals about the size of a USB flashdrive, are the data storage medium of choice in the setting. One of the technical manuals states that they have a storage capacity of 50 gigabytes, which certainly seemed like a lot in the mid 90's, especially for something so small. 20 years later, and there are USB drives commercially available in excess of 250 Gb.
The Centauri hairstyle was a practical joke by Peter Jurasik. His wig hadn't been trimmed yet, so he turned it upside-down and strode into the showrunner's office. JMS went along with it because he wanted the actors to feel like he valued their input; by the time the situation became clear it was too late to go back. It did end up making the Centauri visibly-different from humans.
Claudia and Andrea were jokingly making out on-set one day, and Joe spotted them and wrote it into the show. You never know when the muse will strike.
Thompson: And Joe always said it was about embracing his inner teenager, as well. Christian: [deflated] So, all of that politically correct, diplomatic shit I was talkin' about, you can just forget about that.
Zack's complaints about his ill-fitting uniform were inspired by Jeff Conaway, who was unaware that JMS overheard him griping about the costumes. He was stunned to see his verbatim comments in the script. Conaway wasn't the only one:
JMS: Politically, Jerry was just to the right of Attila the Hun. There is a line in Babylon 5 where his character, Michael Garibaldi, suggests that the way to deal with crime is to go from electric chairs to electric bleachers. That line is quintessential Jerry Doyle. I say this with confidence because I overheard him saying it at lunch then stole it for the show.
JMS was firmly against ad-libbed lines, since he was cagey about people potentially screwing-up his Myth Arc. In the few cases where he allowed it, he had serious, one-on-one talks with the actor involved—such as when Bill Mumy hummed a mantra which turned out to be the title of the album his band made.
One case is "The Fall of Night", the Season 2 finale. The Neville Chamberlain-quoting Earth Ambassador tells Ivanova that his pen was a gift from his wife. Then he smooches the pen. JMS states in that episode's commentary that when he asked the actor (Roy Dotrice OBE) why he did that, the response was, "Well, my wife isn't here, so I can't kiss her, so I kiss the pen instead."
JMS: [chuckling mirthlessly] Ah, actors. Someday they'll all be replaced with CG. I'm kidding. No I'm not. Yes I am.
One very notable ad-lib which got kept: in the broken elevator scene in the episode "Convictions", G'kar was supposed to sound grim and unyielding as he refuses to help Londo escape, even at the cost of his own life. G'Kar's actor, Andreas Katsulas, embraced the irony of the situation and began giggling maniacally. After the take, JMS realized it one of the funniest moments of the show so far.
The creators of B5 are very tight with the fandom, but the relationship is double-edged. Scoggins used to scan the B5 forums and "cry every night" at the anti-Lochley jihad.
After O'Hare left the show under the cloud, one unfortunate rumor floated around the internet. Supposedly, the "real" reason was not because Michael O'Hare was sick, but because "he has a bad cocaine habit" and therefore "never has any money." Apparently JMS supported this particular abuse by raising money to help him out!
Susan/Talia is not mentioned here because it's unambiguous, but fans sensed sexual tension between Lochley and the ghost of her druggie friend in "Day of the Dead". Writer Neil Gaiman confirmed that it's intentional and that Lochley is bisexual.
JMS said he made a point to have pairs of background extras occasionally act like gay couples. His thinking was that homosexuality is common practice at the time due to First Contact with aliens making anything humans do seem more mundane.
Word of Saint Paul: JMS once asked actor Wortham Krimmer to tone down Emperor Cartagia's fey behavior, to which Krimmer responded, "Well, Joe, he's bisexual, don't you know?" JMS gave an oh really sort of reply, and Krimmer shot back, "Absolutely. He's the emperor. He can fuck anyone he wants."
Numerous, but Michael O'Hare having to leave B5 to treat his mental illness was the biggest. Had he stayed, the "War without End" storyline would occured at the end of Season 5 and had a much-slower burn. Moving the resolution to Season 3 caused an unfortunate plot hole: for the remaining two seasons-and-change, the time-travelling Sheridan knows first-hand that a cataclysmic fate awaits Centauri Prime and does sweet f*ck-all to prevent it, which makes him look like a nitwit at times. This urgent news concerning the future of his delicate Intersteller Alliance (which Sheridan came back from the dead to co-found) just conveniently slips his mind, without even a token explanation like Temporal Sickness.
The reason why the end of season 4 seems so crowded, and the beginning of season 5 seems mostly composed of filler, is because the show was about to be Cut Short due to PTEN going under. Season 4 was planned to end with the episode "Intersections in Real Time", and the Earth Civil War would be resolved at the beginning of season 5. Instead, the events of season 4 were shortened by four episodes (removing a story arc about Londo and G'Kar returning to Centauri Prime), and the resolution to the Earth Civil War was crammed into three super-dense episodes. Then, at the last-minute, the show was picked up by cable giant TNT (who would soon regret the purchase). By now they'd already used up half a season's worth of material. They filled the gap by stretching the "telepath-colony" arc and re-inserting the aforementioned Londo/G'Kar plot, as well as including standalone filler episodes, ranging from the yawner "A View from the Gallery" to the Cerebus Rollercoaster which is Neil Gaiman's "Day Of The Dead". A new standalone season 4 finale was also hastily-shot; the intended series finale "Sleeping in Light" was held back 'til the end of season 5.
In the Babylon 5 script books, JMS states that he had Season Five neatly-plotted out... and then the only copy of his notes were stolen while at a con. His failed attempts to recover them resulted in the contentious "Telepath Colony" arc, which was supposed to last three episodes but wound up being eleven. JMS had other plans for S5, but those notes went missing (again) in a hotel room. Compounding the problem was Claudia Christian, the only cast member whom JMS couldn't re-sign; the departure of Ivanova and the introduction of her replacement Lochley caused additional strain on the season.
The only positive to come out of the chaos is that JMS decided at the end of S4 that there was no way he could squash the end of Londo's story in there; this meant it was still available to play out during Season 5, resulting in the second half being better-received than the first.
JMS offered to put the show on hold for a year so O'Hare could get treatment, but O'Hare refused to be the reason why so many people would lose their jobs, as there was no guarantee the show would come back. The wrap-up with Sinclair was filmed after O'Hare got his condition back under control. Strangely for Garibaldi, he never crossed paths with his "old friend" in Season 3, instead communicating over a grainy video recording. This is because Doyle and O'Hare got into a fight beforehand; Doyle gave an ultimatum saying he'd quit if O'Hare remained on the show. Clearly, this ultimatum was still in effect for season 3, which is why Doyle doesn't share any screen time with him.
Claudia Christian broke her ankle◊ between shoots and phoned the studio to inform them. She was certain that her character was going to be written out. Instead, JMS simply wrote her accident into the script and production continued.
Jerry Doyle suffered a broken wrist during the filming of the battle sequence in "Severed Dreams". The very-visible effects were explained by the character sustaining the same injury.
Wayne Alexander is a recurring actor on B5, usually playing characters behind heavy makeup (like Lorien). He went sans fards for his best-remembered role: the Inquisitor a.k.a. Sebastian a.k.a. Jack the Ripper.
Robin Atkin Downes played Byron Gordon in season 5 and Morann, a Minbari, in In the Beginning.
Caitlin Brown made a return appearance as Corey, the human lawyer assigned to represent Sheridan in a murder case ("There the Honor Lies"). Na'toth appeared one last time in Season 5's "A Tragedy of Telepaths".
Carrie Dobro appeared as Harrison (a doctor in "Exogenenis") and a Brakiri (in "Racing Mars") before netting the role of Dureena in A Call to Arms/Crusade.
Ed Wasser is best known for playing the Shadows' Mouth of Sauron, Mr. Morden. In the pre-series pilot movie "The Gathering", he has a bit part as an operations staffer named "Guerra". Neither role involved any makeup, so they looked identical, leading to some fan speculation about Morden making an Early-Bird Cameo as a undercover spy. (This was Jossed.)
John Vickery played two recurring characters: the Warrior-Caste Minbari/Grey Council member Neroon, and Clark propagandist Mr. Welles. Though Minbari makeup was used for the former, his facial structure and voice is very distinctive.
Turhan Bey played two nice elderly gentlemen, Emperor Turhan and Turval.
Death of Personality: A form of capital punishment practiced by Earth Alliance, actual execution having been outlawed except in mutiny and treason cases. Also known as mindwipe, and first spoken of in "The Quality of Mercy".