Firefly: The Train Job
Fox airs the first episode of Joss Whedon’s science fiction series Firefly, starring Nathan Fillion. This episode is actually a replacement for the original pilot, written and produced late in production; strangely enough, the original pilot will also be shown during the course of the first season.
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Sliders: Rules Of The Game
Fox airs the 23rd episode of Tracy Torme’s alternate-universe science fiction series Sliders, starring Jerry O’Connell, John Rhys Davies, Sabrina Lloyd, and Cleavant Derricks. This is the third season premiere.
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Sliders now streaming on Amazon Prime
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Star Trek: TNG: Descent, Part II
The week-long national syndication window opens for the 152nd episode of Star Trek: The Next Generation. This episode opens TNG’s seventh and final season.
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Star Trek: The Next Generation now streaming on Paramount Plus
The Flash
The first episode of the superhero series The Flash, based on the DC Comics character, premieres on CBS, starring John Wesley Shipp (Dawson’s Creek) and Amanda Pays (Max Headroom). Tim Thomerson and Lycia Naff (Star Trek: The Next Generation) guest star.
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Doctor Who: Battlefield, Part 3
The 686th episode of Doctor Who airs on BBC1. Jean Marsh guest stars, and Nicholas Courtney makes his final original series appearance as Brigadier Lethbridge-Stewart. This story opens the 26th and final season of the original Doctor Who series.
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Hubble Space Telescope…for the Apple II
NASA releases an interactive electronic educational guide to the upcoming Hubble Space Telescope for the Apple II computer. Featuring diagrams of the orbiting telescope’s construction, methods of communication with Earth, and how it gathers its images. The software is released ahead of HST’s launch aboard an upcoming shuttle flight.
Quantum Leap: Honeymoon Express – April 27, 1960
NBC airs the ninth episode of Donald Bellisario’s science fiction series Quantum Leap, starring Scott Bakula and Dean Stockwell. Alice Adair guest stars in the second season premiere.
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The Knights Of God, Episode 3
UK regional broadcaster TVS airs the third episode of Richard Cooper’s alternate-history series Knights Of God, portraying a struggle between oppressive government and rugged resistance fighters in a post-civil-war UK. Christopher Bowen guest stars. 
Doctor Who: The Trial Of A Time Lord, Pt. 3
The 644th episode of Doctor Who airs on BBC1. Lynda Bellingham (All Creatures Great & Small) guest stars as the Inquisitor, with Michael Jayston as the Valeyard and David Selby (Dark Shadows) as Sabalon Glitz. The first four parts of the 14-part story are the final complete storyline written by former script editor Robert Holmes, who dies during production.
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The Atari 5200
After a long development process (during which it was briefly known as “Atari Video System X”), Atari introduces its own next-generation video game console, Atari 5200. Dubbed “The Supersystem,” the new console, boasting far better graphics and sound capabilities than the VCS, is hampered by one of the worst controller concepts in video game history. Also not helping the 5200’s chances are the lack of an adapter allowing VCS owners to painlessly transition to the new system, a peripheral already available for the Colecovision. (In keeping with the new system’s name, the VCS is also now marketed as the Atari 2600.)
Hammer House Of Horror: The Thirteenth Reunion
The second episode of the Hammer Studios-produced horror anthology series Hammer House Of Horror airs on ITV. Julia Foster and Dinah Sheridan guest star.
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Doctor Who: The Leisure Hive, Part 4
The 529th episode of Doctor Who airs on BBC1. This is the first story produced by John Nathan-Turner. Adrienne Corri and Nigel Lambert guest star.
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Star Castle
Cinematronics releases the cult classic arcade game Star Castle, a vector graphics game sending players on a mission to create a tiny vulnerability in a space station’s colorful rotating defense shields. Once its shields have been penetrated, a well timed shot can destroy the enemy fortress.
Buck Rogers: Awakening
NBC airs the two-hour pilot movie of Buck Rogers In The 25th Century, a ’70s update of the classic sci-fi pulp hero by Glen A. Larson of Battlestar Galactica fame. Gil Gerard, Erin Gray and Tim O’Connor star in the heavily promoted new series, whose pilot is also shown as a theatrical movie both in America and abroad.
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Star Blazers: Episode 14
The 14th episode of Star Blazers, an English rewrite and dub of the 1974 anime series Space Battleship Yamato, premieres in syndication across the U.S.
High Energy Astronomy Observatory 3
NASA launches the third and final High Energy Astronomy Observatory satellite into Earth orbit, where it begins studying gamma ray sources and the nature of cosmic rays. There is also an experiment package designed to detect heavy atomic nuclei. HEAO-3 will remain in service through May 1981, and it will re-enter Earth’s atmosphere in December of that year.
The Lost Saucer: My Fair Robot
ABC airs the third episode of Sid & Marty Krofft’s The Lost Saucer, starring Jim Nabors (The Andy Griffith Show, Gomer Pyle USMC) and Ruth Buzzi (Rowan & Martin’s Laugh-In). Walker Edmiston (Land Of The Lost) guest stars.
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Doctor Who: Terror Of The Zygons Part 4
The 405th episode of Doctor Who airs on BBC1. This episode marks the final appearance of Brigadier Lethbridge-Stewart until 1983’s Mawdryn Undead. This is also the last UNIT story until the late 1980s.
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Shazam!: Fool’s Gold
The 18th episode of Filmation’s live-action Shazam! series airs on CBS, starring Jackson Bostwick, Michael Gray and Les Tremayne. Dabbs Greer guest stars.
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Shazam! now streaming on Amazon Prime
Far-Out Space Nuts: The Robots Of Pod
The third episode of Sid & Marty Krofft’s Far-Out Space Nuts airs on CBS, starring Bob Denver (Gillgan’s Island) and Chuck McCann (Herbie Rides Again).
Kolchak: The Zombie
ABC airs the second episode of Kolchak: The Night Stalker, based on the 1973 TV movie The Night Stalker and starring Darren McGavin. Scatman Crothers guest stars.
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Kolchak: The Night Stalker now streaming on Amazon Prime
Planet Of The Apes: The Gladiators
The second episode of the TV spinoff of Planet Of The Apes premieres on CBS. Future V star Marc Singer guest stars.
Six Million Dollar Man: The Pioneers
The 15th episode of The Six Million Dollar Man is broadcast on ABC, starring Lee Majors and Richard Anderson. Mike Farrell (The Questor Tapes, M*A*S*H) guest stars.
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Search: One Of Our Probes Is Missing
The second episode of Leslie Steven’s “spy-fi” series Search airs on NBC, starring Tony Franciosa and Burgess Meredith. Stefanie Powers (Hart To Hart) and Larry Linville (M*A*S*H) guest star.
Star Trek: Spock’s Brain
The 56th episode of Gene Roddenberry’s science fiction series Star Trek airs on NBC. This is the first episode of the third season, and the first overseen by new producer Fred Freiberger. Marj Dusay guest stars.
Lost In Space: Kidnapped In Space
The 62nd episode of Irwin Allen’s science fiction series Lost In Space premieres on CBS, starring Guy Williams, June Lockhart, and Jonathan Harris. Grant Sullivan and Carol Williams guest star.
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Lost In Space now streaming on Amazon Prime