The 64th episode of Gene Roddenberry’s science fiction series Star Trek airs on NBC. This marks the first appearance of the Tholians and, though they will be mentioned frequently in later Star Trek spinoffs, the last appearance until the 21st century spinoff series Star Trek: Enterprise.
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Also of interest...
Doctor Who: Midnight
June 14, 2008
Science Fiction Theatre: The Long Day
December 17, 1955
Red Dwarf: Twentica
September 22, 2016