The 19th episode of Filmation’s live-action Shazam! series airs on CBS, starring Michael Gray and Les Tremayne. John Davey takes over the role of Captain Marvel from this episode forward.
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The fourth episode of the children’s superhero series Isis premieres on CBS (sometimes referred to as Secrets of Isis), starring Joanna Cameron. The series is part of a live-action superhero programming block produced by Filmation. 
ABC airs the fourth episode of Sid & Marty Krofft’s The Lost Saucer, starring Jim Nabors (The Andy Griffith Show, Gomer Pyle USMC) and Ruth Buzzi (Rowan & Martin’s Laugh-In). Billy Barty guest stars.
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The 406th episode of Doctor Who airs on BBC1. Prentis Hancock (Space: 1999) guest stars.
The 38th episode of The Six Million Dollar Man is broadcast on ABC, starring Lee Majors and Richard Anderson. Chuck Connors (The Rifleman, Werewolf) guest stars.
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NBC airs the fourth episode of The Invisible Man, starring David McCallum (The Man From UNCLE, Colditz), Melinda Fee, and Craig Stevens. Barbara Anderson (Ironside, Mission: Impossible) guest stars.
Astronomers catch fleeting glimpses of a new natural satellite of Jupiter, Themisto, though the initial estimates of its orbit are “off” enough that Themisto becomes “lost” and isn’t observed again until 2000. With a diameter of roughly five miles, Themisto marks the dividing line between the larger inner moons of Jupiter and the widely-scattered menagerie of asteroid-like outer moons orbiting the planet. Astronomers Elizabeth Roemer and Charles Kowal (who discovered another new Jovian moon in 1974) share credit for discovering the moon. Themisto is the last Jovian satellite to be discovered by ground-based telescope in the 20th century.