The 44th episode of Gene Roddenberry’s science fiction series Star Trek premieres on NBC. This early script by writer David Gerrold becomes the best-loved episode of the entire series (according to many a fan poll), introducing the rapidly-reproducing, rapidly-eating, Klingon-sniffing Tribbles to the Star Trek universe. This is their only appearance in the original series, though they reappear in two animated series and Deep Space Nine years later. 
ABC broadcasts the 17th and final episode of the Filmation animated series Journey To The Center Of The Earth, very loosely based on the 1959 movie of the same name. Ted Knight, Pat Harrington Jr., and Jane Webb lead the voice cast.
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The 187th episode of Doctor Who airs on the BBC. Patrick Troughton plays a double role, starring as both the Doctor and as the ruthless dictator Salamander, in a story set in Earth’s future. Previously missing from the BBC’s archives, a copy of this episode was recovered in Nigeria in 2013.
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 16th episode of Irwin Allen’s science fiction series The Time Tunnel airs on ABC, starring James Darren and Robert Colbert. Whit Bissell and Lee Meriwether geust star.
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ITV broadcasts the 14th episode of The Prisoner, produced, occasionally written by, and starring Patrick McGoohan. Alexis Kanner guest stars as The Kid. When The Prisoner is broadcast in 1968 in the United States, CBS censors interpret this Western-themed episode as a criticism of the American position in the Vietnam War and the network completely omits it from the running order. 
The 98th episode of Irwin Allen’s adventure series Voyage To The Bottom Of The Sea airs on ABC, starring Richard Basehart and David Hedison. Malachi Throne guest stars.
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The 34th episode of Larry Cohen’s science fiction series The Invaders, starring Roy Thinnes and produced by Quinn Martin’s QM Productions, is broadcast on ABC. William Smithers guest stars.
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The 75th episode of Irwin Allen’s science fiction series Lost In Space premieres on CBS, starring Guy Williams, June Lockhart, and Jonathan Harris.
The 45th episode of Gene Roddenberry’s science fiction series Star Trek premieres on NBC. Kirk, Chekov and Uhura find themselves drafted into playing deadly games for the amusement of unfathomable aliens; naturally, Kirk has a female “drill thrall” and introduces her to his own brand of inter-species relations.
The 188th episode of Doctor Who airs on the BBC. Patrick Troughton plays a double role, starring as both the Doctor and as the ruthless dictator Salamander, in a story set in Earth’s future.
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!
Order Earl Green’s book VWORP!1 from theLogBook.com Store
ITV broadcasts the 15th episode of The Prisoner, produced, occasionally written by, and starring Patrick McGoohan. Kenneth Griffith guest stars as Number Two.
The 99th episode of Irwin Allen’s adventure series Voyage To The Bottom Of The Sea airs on ABC, starring Richard Basehart and David Hedison. Walter Burke 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 35th episode of Larry Cohen’s science fiction series The Invaders, starring Roy Thinnes and produced by Quinn Martin’s QM Productions, is broadcast on ABC. Ahna Capri (Enter The Dragon) 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 76th episode of Irwin Allen’s science fiction series Lost In Space premieres on CBS, starring Guy Williams, June Lockhart, and Jonathan Harris. Robert Foulk and Arte Johnson guest star.
The 46th episode of Gene Roddenberry’s science fiction series Star Trek premieres on NBC. Kirk and Spock gang up on a society who has taken a piece of outdated Earth literature and turned it into a blueprint for a blood-soaked society. (As heavy as that sounds, much hilarity ensues.) Vic Tayback (Alice) guest stars.
The 189th episode of Doctor Who airs on the BBC. Patrick Troughton plays a double role, starring as both the Doctor and as the ruthless dictator Salamander, in a story set in Earth’s future. Previously missing from the BBC’s archives, a copy of this episode was recovered in Nigeria in 2013.
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!
Order Earl Green’s book VWORP!1 from theLogBook.com Store
ITV broadcasts the 16th episode of The Prisoner, produced, occasionally written by, and starring Patrick McGoohan. Leo McKern guest stars as Number Two.
The 36th episode of Larry Cohen’s science fiction series The Invaders, starring Roy Thinnes and produced by Quinn Martin’s QM Productions, is broadcast on ABC. Joanne Linville 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 77th episode of Irwin Allen’s science fiction series Lost In Space premieres on CBS, starring Guy Williams, June Lockhart, and Jonathan Harris. John Crawford and Byron Morrow guest star.
The 47th episode of Gene Roddenberry’s science fiction series Star Trek premieres on NBC. The Enterprise crew goes up against a psychedelic giant microbe (actually one of the most impressive effects of the original series).
The 190th episode of Doctor Who airs on the BBC. Patrick Troughton plays a double role, starring as both the Doctor and as the ruthless dictator Salamander, in a story set in Earth’s future. Previously missing from the BBC’s archives, a copy of this episode was recovered in Nigeria in 2013.
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!
Order Earl Green’s book VWORP!1 from theLogBook.com Store
ITV broadcasts the 17th and final episode of The Prisoner, produced, occasionally written by, and starring Patrick McGoohan. Leo McKern guest stars as Number Two. Loaded with cryptic imagery that defies straightforward interpretation in the traditions of linear storytelling, the series finale confounds viewers to this day. In interviews given years later, McGoohan claims the outcry over this finale led to the end of his career as a writer or actor in the UK.
The 100th episode of Irwin Allen’s adventure series Voyage To The Bottom Of The Sea airs on ABC, starring Richard Basehart and David Hedison. Victor Lundin 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 78th episode of Irwin Allen’s science fiction series Lost In Space premieres on CBS, starring Guy Williams, June Lockhart, and Jonathan Harris.
The 191st episode of Doctor Who airs on the BBC. Patrick Troughton plays a double role, starring as both the Doctor and as the ruthless dictator Salamander, in a story set in Earth’s future. Previously missing from the BBC’s archives, a copy of this episode was recovered in Nigeria in 2013.
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!
Order Earl Green’s book VWORP!1 from theLogBook.com Store
The 101st episode of Irwin Allen’s adventure series Voyage To The Bottom Of The Sea airs on ABC, starring Richard Basehart and David Hedison. Paul Mantee 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 37th episode of Larry Cohen’s science fiction series The Invaders, starring Roy Thinnes and produced by Quinn Martin’s QM Productions, is broadcast on ABC. J.D. Cannon 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 79th episode of Irwin Allen’s science fiction series Lost In Space premieres on CBS, starring Guy Williams, June Lockhart, and Jonathan Harris. Michael Conrad guest stars.
The 48th episode of Gene Roddenberry’s science fiction series Star Trek premieres on NBC. Though it will become best remembered for the furry horned creature that attacks Kirk, the episode is actually a surprisingly hawkish (for Star Trek) allegory to the Vietnam War written by Roddenberry himself.
The 192nd episode of Doctor Who airs on the BBC. This story sees the return of the Yeti, now in the modern-day London Underground.