The week-long national syndication window opens for the 22nd episode of Babylon 5, bringing the show’s first season to a close, despite being held back to air just one week prior to the second season premiere. This marks the final appearance of Michael O’Hare as a series regular. Ed Wasser guest stars as Mr. Morden. 
The week-long national syndication window opens for the 73rd episode of Xena: Warrior Princess, starring Lucy Lawless and Renee O’Connor. Karl Urban guest stars.
The 26th episode of Gene Roddenberry’s Earth: Final Conflict, airs in syndication, starring Robert Leeshock, Lisa Howard, Von Flores, and Richard Chevolleau.
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The 11th episode of the Sci-Fi Channel original series Welcome To Paradox airs, a loosely-connected anthology of science fiction stories set in Betaville, a utopian future city whose incredible technology has frequently unintended side-effects. Robert Moloney (K-9) stars in a story co-written by SF novelist Donald Varley.
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The week-long national syndication window opens for the 153rd episode of Star Trek: Deep Space Nine. This episode is a follow-up to the previous season’s Statistical Probabilities.
The 60th episode of Joss Whedon’s supernatural series Buffy The Vampire Slayer, starring Sarah Michelle Gellar, airs on the WB network. Anthony Stewart Head and Alyson Hannigan also star. Aldis Hodge guest stars.
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Big Finish Productions releases the 25th Doctor Who audio drama in its main monthly range, starring Sylvester McCoy and Sophie Aldred. David Tennant guest stars.
The 25th episode of James Cameron & Charles H. Eglee’s cyberpunk series Dark Angel, starring Jessica Alba and Michael Weatherly, airs on Fox. Tyler Labine (Invasion) guest stars.
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The 18th episode of the radio science fiction comedy series The Hitchhiker’s Guide To The Galaxy is broadcast on BBC Radio, concluding Dirk Maggs’ adaptation of Douglas Adams’ novel Life, The Universe, And Everything with most of the original radio cast. A radio version of the fourth novel, So Long, And Thanks For All The Fish, will follow in 2005.
ABC premieres the sixth episode of Shaun Cassidy’s sci-fi/horror series Invasion, starring William Fichtner (Contact), Eddie Cibrian, and Lisa Sheridan.
The 41st episode of The Sarah Jane Adventures airs on CBBC, starring Elisabeth Sladen (Doctor Who). Matt Smith and Katy Manning guest star.
The first episode of Supergirl premieres on CBS, starring Melissa Benoist, Mehcad Brooks and Chyler Leigh. Dean Cain and Helen Slater guest star. The show is produced by Greg Berlanti and Andrew Kreisberg, producers of Arrow and The Flash on the CW, another CBS-owned network. 
The 96th episode of Arrow, a modern-day reboot of DC Comics’ Green Arrow superhero starring Stephen Amell, airs on the CW.
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The 118th episode of Arrow, a modern-day reboot of DC Comics’ Green Arrow superhero starring Stephen Amell, airs on the CW.
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Fox airs the seventh episode of the science fiction comedy-drama The Orville, starring and created by Seth McFarlane. Giorgia Whigham (13 Reasons Why) and Steven Culp (Star Trek: Enterprise, Desperate Housewives) guest star.
The 70th episode of the science fiction comedy Red Dwarf airs on UK cable/satellite comedy channel Dave. Johnny Vegas (Benidorm, Ideal) and Jamie Chapman (Extras) guest star.
Actor Walter Koenig, best known for portraying Ensign Pavel Chekov in the original Star Trek series, dies at the age of 90. Already a busy young actor at the time he debuted in the second season of Star Trek, Koenig had already crossed paths with that show’s creator, Gene Roddenberry, in an episode of Roddenberry’s prior military series, The Lieutenant, in 1964. Following his work on Star Trek’s second and third seasons, Koenig continued acting, but also took up writing, penning an episode of the 1970s animated Star Trek (while being the only main/recurring cast member not to reprise their role). Alongside his return to the role of Chekov in Star Trek: The Motion Picture, he released a first-person chronicle of the movie’s production, Chekov’s Enterprise; his first novel, Buck Alice and the Actor-Robot, followed in 1988. In the 1990s, he took on a recurring villainous role in Babylon 5, that of Psi Cop Bester, who made numerous appearances throughout the show’s five seasons (and nearly returned in the spinoff series Crusade). He would appear as Chekov through Star Trek: Generations, though he later made a few appearances in fan productions and played a surprise voice role in the final episode of Star Trek: Picard, all while appearing at conventions and in documentaries covering the Star Trek phenomenon.