The first unmanned space probe to use a gravity assist maneuver to get from one planet to another in a reduced amount of time, Mariner 10 is lauched on a course for the planet Venus, where a carefully planned trajectory allows it to take pictures and measurements at that planet before using Venus’ gravity to fling Mariner 10 inward toward Mercury, allowing it to reach two planets in under two months. It will be the first space probe to visit Mercury.
The seventh episode of the short-lived Canadian-made science fiction series The Starlost, Circuit Of Death, premieres. 
The eighth episode of the horror anthology series The Evil Touch airs on Australia’s Nine Network, hosted by Anthony Quayle (Strange Report). (The series will later appear in the U.S. and elsewhere in first-run syndication.) Julie Harris (Knots Landing) guest stars.
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NASA and the National Oceanic & Atmospheric Administration launch NOAA-3, a weather satellite intended to operate in a near-polar low Earth orbit. NOAA-3 is based on the already-flown ITOS satellite design, and will wait in orbit until March 1974, when the failure of an instrument aboard its predecessor, NOAA-2, requires putting NOAA-3 on full weather-watching duty, where it will remain without any major malfunctions through August 1976.
The tenth episode of the animated Star Trek series premieres on NBC, written by Harry Mudd’s creator, Stephen Kandel, and featuring Roger C. Carmel reprising the role of Mudd.
The eighth episode of the short-lived Canadian-made science fiction series The Starlost, Gallery Of Fear, premieres.
The ninth episode of the horror anthology series The Evil Touch airs on Australia’s Nine Network, hosted by Anthony Quayle (Strange Report). (The series will later appear in the U.S. and elsewhere in first-run syndication.) Vic Morrow (Combat!, Twilight Zone: The Movie) guest stars.
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The first episode of the British comedy series Robert’s Robots airs on ITV licensee Thames Television, starring John Clive (A Clockwork Orange, Yellow Submarine) as eccentric inventor Robert Sommerby and Nigel Pegram as one of his robot creations.
The third and final crew of the first American space station, Skylab 4, lifts off for an 84-day stay. The crew’s tasks include medical and biological experiments, solar observations (including the first space-based recording of solar flare origination), and observations of Comet Kohoutek. Crewmembers Gerald Carr, William Pogue and Edward Gibson have a frank discussion with ground controllers about their extremely busy work schedule (similar to heated discussions between Apollo 7’s crew and Houston) halfway through the nearly-three-month mission. Skylab is left powered down, but still habitable, at the end of the crew’s stay, in anticipation that future Space Shuttle crews will someday occupy Skylab.
The 11th episode of the animated Star Trek series premieres on NBC, with a script by original series writer Stephen Kandel.
The ninth episode of the short-lived Canadian-made science fiction series The Starlost, Mr. Smith Of Manchester, premieres.
The third TV movie in the Six Million Dollar Man series premieres on ABC, starring Lee Majors and Richard Anderson. Maurice Evans (Planet Of The Apes) and Terry Carter (Battlestar Galactica) guest star. This is the final TV movie before The Six Million Dollar Man goes weekly in 1974.
The 12th episode of Orson Welles’ Great Mysteries is broadcast on ITV licensee Anglia Television, starring David Birney (Serpico, St. Elsewhere) and Anthony Ainley (Doctor Who), with Welles providing his customary introductory and closing narration.
The tenth episode of the horror anthology series The Evil Touch airs on Australia’s Nine Network, hosted by Anthony Quayle (Strange Report). (The series will later appear in the U.S. and elsewhere in first-run syndication.) Susan Strasberg guest stars.
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The second episode of the British comedy series Robert’s Robots airs on ITV licensee Thames Television, starring John Clive (A Clockwork Orange, Yellow Submarine) as eccentric inventor Robert Sommerby and Nigel Pegram as one of his robot creations.
Electric Light Orchestra‘s third album, On The Third Day, is released, featuring the singles “Showdown” and “Ma-Ma-Ma Belle”.
Written and directed by science fiction author Michael Crichton, Westworld debuts in theaters, mashing up familiar western tropes with a tale of cyborgs gone mad. Richard Benjamin (Quark), James Brolin, and Yul Brynner guest star; Majel Barrett (Star Trek) and Dick Van Patten play cameo roles. A hit for MGM, Westworld will spawn many attempts to follow up on its success, from the 1976 movie Futureworld to numerous TV revivals well into the 21st century. 
The tenth episode of the short-lived Canadian-made science fiction series The Starlost, The Alien Oro, premieres. Walter Koenig guest stars.
The 11th episode of the horror anthology series The Evil Touch airs on Australia’s Nine Network, hosted by Anthony Quayle (Strange Report). (The series will later appear in the U.S. and elsewhere in first-run syndication.) Darren McGavin (Kolchak: The Night Stalker) guest stars.
This series is not yet chronicled in the LogBook. You could join theLogBook team and write this guide or support the webmaster’s efforts to expand the site.
The third episode of the British comedy series Robert’s Robots airs on ITV licensee Thames Television, starring John Clive (A Clockwork Orange, Yellow Submarine) as eccentric inventor Robert Sommerby and Nigel Pegram as one of his robot creations.
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