Ark II: The Rule
CBS airs the eighth episode of Filmation’s live-action Saturday morning science fiction series Ark II. 
Electra Woman & Dyna Girl: Ali Baba, Part 2
ABC airs the eighth episode of Electra Woman & Dyna Girl, part of the Krofft Supershow Saturday morning children’s programming block. This is part two of a two-part story, each episode lasting only around 12 minutes. Sid Haig (Jason Of Star Command) and Malachi Throne guest star.
Monster Squad: Ultra Witch
NBC airs the eighth episode of Monster Squad, a live-action Saturday morning comedy starring Fred Grandy. Julie Newmar (Batman) guest stars.
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Beasts: Buddyboy
ITV broadcasts the third episode of horror anthology Beasts, created and written by Nigel Kneale (Quatermass). Martin Shaw (The Professionals) stars.
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Doctor Who: The Deadly Assassin, Part 1
The 436th episode of Doctor Who airs on BBC1. For the first time in the series’ history, the Doctor is seen to be traveling without a companion, and this story marks his second visit to the Time Lords’ planet Gallifrey since the beginning of the series. Much of the Time Lord mythology is derived from this story. Peter Pratt guest stars as the Master.
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Space: 1999: Mission Of The Darians
The ninth episode of Gerry Anderson’s space adventure series Space: 1999, Mission Of The Darians premieres on British broadcaster ITV. Joan Collins guest stars.
Far-Out Space Nuts: Dangerous Game
The ninth 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).
The Avengers: Whoever Shot Poor George Oblique Stroke XR40?
British broadcaster Thames Television airs the 134th episode of the spy-fi series The Avengers, starring Patrick Macnee and Linda Thorson.
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Voyage To The Bottom Of The Sea: Deadly Waters
The 65th episode of Irwin Allen’s adventure series Voyage To The Bottom Of The Sea airs on ABC, starring Richard Basehart and David Hedison. Don Gordon guest stars.
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It’s About Time: Mark Your Ballots
The eighth episode of the time travel sitcom It’s About Time, created by Sherwood Schwarz (I Dream Of Jeannie) and starring Frank Aletter, Jack Mullaney, and Imogene Coca, is broadcast on CBS.
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Thunderbirds: Ricochet
UK broadcaster ATV Midlands airs the 31st episode of Gerry Anderson’s Supermarionation science fiction series Thunderbirds, featuring the voices of Shane Rimmer, David Graham, Sylvia Anderson, Ray Barrett, and Peter Dyneley.
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Doctor Who: Death Of A Spy
The 89th episode of Doctor Who airs on the BBC. This is part three of the story now collectively known as The Myth Makers. This episode is missing from the BBC’s archives.
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AN602: Tsar Bomba
The Soviet Union detonates the most powerful thermonuclear weapon built to date, code-named AN602, or, more informally, “Tsar Bomba”. Though it’s designed to deliver a yield of 100 megatons, the 27-ton device is only fueled enough to produce a 50-megaton explosion, still enough to be detected by other nations. (A U.S. reconnaissance aircraft is close enough to witness the detonation, so the test is hardly a secret to the western world.) The detonation registers on seismic sensors, and interferes with radio transmissions nearby for nearly an hour; the explosion is visible as far away as Norway and Alaska. Due to modifications made to avoid endangering the Soviet population, fallout is minimal, though that might not be the case were the weapon to be deployed offensively.
Twilight Zone: Walking Distance
CBS airs the fifth episode of Rod Serling’s anthology series The Twilight Zone. Gig Young stars (and a very young Ron Howard guest stars) in a script written by Serling.
13 Demon Street: Fever
The second episode of the syndicated horror anthology series 13 Demon Street airs on stations across the U.S. Hosted by Lon Chaney Jr. (The Wolf Man), and created (and frequently written and directed) by Curt Siodmak (The Wolf Man, The Invisible Man Returns), the series was filmed in Sweden with a motley mixture of American, British, and Swedish actors, with mostly Swedish talent behind the scenes. Alf Kjellin (Ice Station Zebra) guest stars.
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