NBC airs the 11th episode of the supernatural anthology series Ghost Story, produced by 1960s horror movie mogul William Castle and starring Sebastian Cabot. Hal Linden and Mike Farrell guest star. (This series will be retitled Circle Of Fear in 1973.)
The 22nd episode of The Sixth Sense airs on ABC, starring Gary Collins. Stefanie Powers (The Girl From UNCLE, Hart To Hart) guest stars.
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The final manned lunar landing mission lifts off atop a Saturn V rocket. Apollo 17 is the first mission to include a qualified geologist, Harrison Schmitt, in its crew; Gene Cernan and Schmitt descend to the surface aboard the lunar lander Challenger, where the last two men to walk on the moon spend a total of 22 hours exploring the Taurus-Littrow valley. For the third mission in a row, a lunar rover is stowed into one side of the lander. Astronaut Ron Evans orbits overhead in the command/service module America. The astronauts return on December 19th, bringing home nearly 250 pounds of lunar soil and rock samples.
NBC airs the 12th episode of the supernatural anthology series Ghost Story, produced by 1960s horror movie mogul William Castle and starring Sebastian Cabot. Geraldine Page and Rip Torn guest star. (This series will be retitled Circle Of Fear in 1973.)
The 23rd episode of The Sixth Sense airs on ABC, starring Gary Collins.
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NBC premieres the 37th episode of Rod Serling’s Night Gallery, an anthology series of original short plays and short story adaptations hosted by Rod Serling. Stuart Whitman (Night Of The Lepus), Barbara Anderson (Star Trek, Ironside), and Ellen Corby (The Waltons) guest star. 
NASA launches the Nimbus 5 satellite, designed to observe weather patterns from orbit and test new weather and climate detection technologies. Launched into a polar orbit from Vandenberg Air Force Base in California, Nimbus 5 includes newly-developed experiments to examine Earth in the microwave and infrared portions of the spectrum.
NBC airs the 13th episode of the supernatural anthology series Ghost Story, produced by 1960s horror movie mogul William Castle and starring Sebastian Cabot. Angie Dickinson and Madlyn Rhue guest star.
The 24th episode of The Sixth Sense airs on ABC, starring Gary Collins. Meg Foster (Cagney & Lacey) guest stars; Richard Hatch (Battlestar Galactica) appears in one of his earliest screen roles.
NBC airs the 38th episode of Night Gallery, an anthology series of original short plays and short story adaptations hosted by Rod Serling. Burgess Meredith guest stars.
NBC airs the 11th episode of Leslie Steven’s “spy-fi” series Search, starring Hugh O’Brian and Burgess Meredith. Mark Lenard (Star Trek) guest stars.
NBC airs the 14th episode of the supernatural anthology series Ghost Story, produced by 1960s horror movie mogul William Castle and starring Sebastian Cabot. Patricia Neal and Craig Stevens guest star. This is the final episode to air under the “Ghost Story” banner; the series will be retitled Circle Of Fear when it returns to the schedule in 1973.
The 25th and final episode of The Sixth Sense airs on ABC, starring Gary Collins. Percy Rodrigues (Star Trek), Tom Bosley (Happy Days), and Frank Ashmore (V) guest star.
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NBC airs the 39th episode of Night Gallery, an anthology series of original short plays and short story adaptations hosted by Rod Serling. Leonard Nimoy (Star Trek) guest stars.
In the British tradition of scary stories on Christmas, and hearkening back to the early days of BBC science fiction, BBC2 airs The Stone Tape, written by Nigel Kneale (Quatermass) and starring Michael Bryant, Jane Asher, and Iain Cuthbertson (Children Of The Stones). The production leaves a lasting impression upon its viewers.
The 330th episode of Doctor Who airs on BBC1. This is the series’ first “multi-Doctor” celebratory story, featuring Patrick Troughton as the second Doctor, with appearances by William Hartnell as the first Doctor (though Hartnell’s participation in the story has been significantly reduced due to his failing health; he never appears on set with his successors, appearing only in pre-recorded film inserts). Stephen Thorne guest stars as Omega. Oddly, given the timing of this episode’s broadcast, the “tenth anniversary story” begins airing closer to the ninth anniversary of Doctor Who’s premiere than its tenth.