The 75th episode of the science fiction anthology series Tales Of Tomorrow airs on ABC, starring Leslie Nielsen.
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The 146th episode of Rod Serling’s The Twilight Zone airs on CBS. Michael Constantine and Paul Fix appear in an episode written by Serling.
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The 64th episode of Doctor Who airs on the BBC. This is part one of the story now collectively known as The Crusade. 
Soviet cosmonaut Yuri Gagarin, the first human space traveler, dies along with a flight instructor in a MiG jet fighter crash. Considered too valuable a publicity asset to risk in another spaceflight, Gagarin had been barred from any further space missions. Several investigations into the fatal crash are conducted, with none of them reaching any definitive conclusions, though unfavorable flying weather and a sudden dive (possibly also a result of the weather) are commonly cited factors. Gagarin’s ashes are buried in the wall of the Kremlin.
NASA and JPL launch the unmanned Mariner 7 space probe on a mission to Mars, where it will be joined by its recently-launched identical twin, Mariner 6. Mariner 7 will take five months to reach the red planet, but on a slightly faster trajectory it will arrive just days behind Mariner 6. Both will fly past Mars twice as close as the planet’s previous unmanned visitors.
The 291st episode of Doctor Who airs on BBC1. Roger Delgado guest stars as the Master.
This timeline entry leads to an entry covering this entire Doctor Who serial; there are plans to write new episodic entries in the future. You can support this effort!
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The week-long syndication window opens for the 13th episode of The Next Step Beyond, a revival of the 1950s/60s supernatural anthology series One Step Beyond, hosted and directed by John Newland.
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BBC1 premieres the 13th episode of Terry Nation’s science fiction series Blake’s 7. This episode is the second part of a trilogy spanning the first and second seasons, involving the acquisition of a supercomputer called Orac. Derek Farr guest stars.
BBC1 premieres the 25th episode of Terry Nation’s science fiction series Blake’s 7. This continues the story arc concerning Blake’s search for the Federation’s central control facility.
Following eleven days of precursory earthquake activity, Mt. St. Helens, a volcano in Washington which has been dormant for over a century, emits a small eruption of ash and steam. Similar eruptions continue on an hourly basis, though the frequency will gradually diminsh through April. This activity lasts barely a month before ending, at least for a week or two. The north face of Mt. St. Helens begins bulging noticeably, and emergency planners fight to keep sightseers away from the mountain while drawing up evacuation plans for nearby populated areas. Some locals vow to remain despite possible evacuation orders.
NBC airs the 21st episode of Buck Rogers In The 25th Century. Sid Haig (Jason Of Star Command), Pamela Hensley and Michael Ansara guest star.
Sega releases the arcade game Pulsar in American arcades. The coin-op video game is a maze game pitting the player’s tank against enemy tanks and the structure of the maze itself.
Buckner & Garcia’s hit single Pac-Man Fever reaches its peak on the Billboard Hot 100, reaching #9 on the chart. Over a million copies of the single (backed with an instrumental version of the same song) have sold.
The seventh episode of Brian Daley’s radio drama adaptation of the Star Wars sequel The Empire Strikes Back airs on National Public Radio stations in the U.S. Mark Hamill and Anthony Daniels reprise their movie roles; Billy Dee Williams provides the voice of Lando Calrissian.
NBC airs the 18th episode of James D. Parriott’s time travel series Voyagers!, starring Jon-Erik Hexum and Meeno Peluce. Sam Scarber guest stars as Joe Louis. NBC cancels the series after this broadcast, with two remaining episodes being delayed until they are “burned off” in a summer time slot.
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Voyagers! now streaming on Amazon Prime
The 43rd episode of Steven Spielberg’s anthology series Amazing Stories airs on NBC.
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Amazing Stories now streaming on Amazon Prime
The Soviet Union loses all contact with the unmanned Mars probe Phobos 2 during a close flyby of the inner Martian moon Phobos, where the vehicle had been programmed to deposit a pair of surface landers. Unable to reacquire communications with Phobos 2, Soviet ground controllers later discover a fatal error in the programming of the probe’s on-board computer, leading to a loss of attitude control similar to the incident that doomed Phobos 1 in 1988. Since delivery of the landers never occurs, the mission is deemed a failure.
The week-long national syndication window opens for the 37th episode of Star Trek: The Next Generation.
The 18th episode of Love & Curses (formerly titled She-Wolf Of London) is broadcast in syndication in North America, starring Kate Hodge and Neil Dickson. Kim Morgan Greene guest stars.
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NBC airs the 45th episode of Donald Bellisario’s science fiction series Quantum Leap, starring Scott Bakula and Dean Stockwell. Denise Gentile (Babylon 5) guest stars.
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NBC airs the fifth episode of Wes Craven’s Nightmare Cafe, starring Robert Englund (V, A Nightmare On Elm Street), Jack Coleman (Heroes), and Lindsay Frost (Mancuso, FBI). Angela Bassett (Black Panther, Contact), Vondie Curtis-Hall (Chicago Hope, Daredevil), and William B. Davis (The X-Files) guest star.
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The 13th episode of George Lucas’ historical adventure series The Young Indiana Jones Chronicles airs on ABC, starring Sean Patrick Flanery. Roger Sloman (The Tomorrow People) guest stars.
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The 19th episode of Lois & Clark: The New Adventures Of Superman airs on ABC, starring Dean Cain and Teri Hatcher. Tracy Scoggins, John Shea, and Robert Beltran (Star Trek: Voyager) guest star.
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Lois & Clark: The New Adventures Of Superman now streaming on Amazon Prime
The week-long American syndication window opens for the 19th episode of Gerry Anderson’s sci-fi police series Space Precinct. Michael Shannon (Future Cop) guest stars.
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Space Precinct now streaming on Shout! Factory
Showtime airs the 71st episode of The Outer Limits, a revival of the 1960s science fiction anthology series. Lou Diamond Phillips guest stars.
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Sony Records releases Pete Yorn‘s debut album, musicforthemorningafter, featuring the singly “Life On A Chain”.
The 15th episode of James Cameron & Charles H. Eglee’s cyberpunk series Dark Angel, starring Jessica Alba and Michael Weatherly, airs on Fox. John Savage and Mark Rolston guest star.
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Big Finish Productions releases the 30th Doctor Who audio drama in its main monthly range, starring Paul McGann and India Fisher.
The 18th episode of the Star Trek prequel spinoff Enterprise premieres on UPN. Ethan Phillips (Star Trek: Voyager) and Jeffrey Combs, both veteran Ferengi guest stars on past Star Trek spinoffs, guest star as Ferengi characters.
Big Finish Productions releases the 42nd Doctor Who audio drama in its main monthly range, starring Sylvester McCoy, Sophie Aldred, and Lisa Bowerman. Michael Praed (Robin Of Sherwood) guest stars.