The 28th episode of ABC’s science fiction anthology series, Tales Of Tomorrow, airs on ABC, with each episode’s opening titles proclaiming that the series is produced “in cooperation with the Science-Fiction League of America”, a collective of sci-fi writers including Isaac Asimov and Theodore Sturgeon among its members. This episode is no longer in the archives and may be lost.
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ABC airs the 88th episode of the supernatural anthology series One Step Beyond, hosted and directed by John Newland. Donald Pleasance and Adrienne Corri guest star.
The 116th episode of Rod Serling’s The Twilight Zone airs on CBS. Albert Salmi and John Anderson star.
The 21st episode of Doctor Who airs on the BBC. This is part one of the story now collectively known as 
NBC airs 
On the 45th anniversary of a similar severe weather event, a major outbreak of violent tornadoes strikes the northern midwest, causing 271 deaths and over a thousand injuries in Wisconsin, Illinois, Indiana, Iowa, Ohio, and Michigan; 137 of the deaths occur in Indiana alone. With weather radar still in its infant state, a radio station in Cedar Rapids spots the first storm on its own radar, while nearby National Weather Service offices do not have radar yet. The U.S. Weather Bureau’s confusing system of “tornado forecasts” and “tornado alerts” is changed to more clearly delineated “watches” and “warnings” after this event.
The 14th episode of Larry Cohen’s science fiction series The Invaders, starring Roy Thinnes and produced by Quinn Martin’s QM Productions, premieres on ABC. Robert Walker Jr. (Star Trek) guest stars.
The 
The third planned lunar landing mission, Apollo 13, lifts off. Astronauts Jim Lovell and Fred Haise are scheduled to walk in the Fra Mauro region of the moon. Command module pilot Ken Mattingly falls victim to a medical condition, leaving NASA to make a rare substitution, rotating the backup crew’s command module pilot, Jack Swigert, to the prime crew prior to launch.
NBC airs the 23rd episode of Leslie Steven’s “spy-fi” series Search, starring Doug McClure and Burgess Meredith. Michael Pataki guest stars in the final episode of the series.
The Apple I computer is available for sale, for the price of $666.66, a price set as a practical joke by Apple Computer cofounder Steve Wozniak, who is also the designer of the system’s architecture. The computer is sold as a circuit board, requiring end users to construct their own enclosure to protect it (the elaborate wood casing shown here was neither typical nor standard-issue). Wozniak’s ambitions for an expandable system are built into the Apple I, including add-on memory cards that can expand its native 4K of memory to as much as 48K, with an interface for an optional cassette data storage system. Nearly 200 units are built and sold, but Apple will recall them, offering users an opportunity to upgrade to the Apple II upon that system’s introduction the following year.
Two years after the shutdown of its orbiter leaves it sending observations of the Martian environment back to Earth at a low bit rate, the 
The 54th episode of the live-action series based on Marvel’s comic The Incredible Hulk airs on CBS, starring Bill Bixby, Jack Colvin, and Lou Ferrigno. This episode concludes the third season.
CBS airs the 24th episode of a revival of Rod Serling’s The Twilight Zone. Victor Garber (Alias, Legends Of Tomorrow) and Jenny Agutter (Logan’s Run) star in an episode comprised of two short stories, A Day In Beaumont (written by David Gerrold) and The Last Defender Of Camelot, adapted by George R.R. Martin from Roger Zelazny’s short story. This episode closes the first season.
The week-long national syndication window opens for 
Silva Screen releases the compilation album 
The fifth episode of RoboCop: The Series airs in syndication, starring Richard Eden, Yvette Nipar, Blu Mankuma, and Andrea Roth.
Christopher Franke’s 
Fox airs the 43rd episode of Tracy Torme’s alternate-universe science fiction series Sliders, starring Jerry O’Connell, Sabrina Lloyd, Cleavant Derricks, and Kari Wuhrer. Neil Dickson (She-Wolf Of London) guest stars.
The 134th episode of Chris Carter’s modern-day science fiction series The X-Files airs on Fox, starring Gillian Anderson and David Duchovny. John Diehl (Miami Vice) guest stars.
The ninth and final episode of the science fiction comedy series The Strangerers is broadcast on Sky One, created and written by Rob Grant (Red Dwarf), starring Mark Williams and Jack Docherty. Paul Darrow (Blake’s 7) guest stars.
UPN premieres the first episode of the supernatural crime comedy series Special Unit 2, starring Michael Landes (Lois & Clark: The New Adventures Of Superman) and Alexondra Lee (Party Of Five). 
UPN airs the 
The European Space Agency’s Venus Express space probe – the first unmanned spacecraft to closely examine the second planet from the sun since the late 1970s – arrives at the planet to undertake a detailed study of the atmosphere, the unusually symmetrical cloud patterns of the planet’s north and south hemispheres, as well as observing the massive, hurricane-like vortices which remain over the poles. Venus Express also looks for the source of traces of sulphur dioxide in the Venusian atmosphere, which could be a sign that of active volcanoes on the surface.
Sci-Fi Channel airs the 
The 
UK cable channel Disney XD airs the 
The 24th episode of the science fiction series The Expanse, based on the series of novels by James S.A. Corey (a pseudonym for writers Ty Franck and Daniel Abraham), is broadcast on cable channel Syfy, opening the series’ third season.
The