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!
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ITV broadcasts 
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.
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 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.
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Starring Charlton Heston and Roddy McDowall, 20th Century Fox’s big-screen release of Planet Of The Apes quickly becomes one of 1968’s movie success stories, and easily one of the year’s two most influential genre films. Propelled into the future aboard a spacecraft from Earth, a trio of astronauts find themselves on a world ruled by sentient apes with no love of humanity whatsoever – for humanity nearly destroyed their world. The studio almost immediately sets the wheels in motion for a sequel. 
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For the second year running, NBC makes an announcement over the closing credits of Star Trek, reassuring viewers that NBC has picked up the show for a third season. Where the second season’s renewal was brought about by a substantial fan letter-writing campaign (with guidance from Gene Roddenberry), the third season pickup comes after fans stage protest marches outside NBC’s headquarters in Burbank and New York, having gotten word (from Star Trek fan Bjo Trimble, by way of Roddenberry) that the series is likely to be cancelled. The renewal is a double-edged sword, however: in the fall, NBC will move the series to Friday nights, a time slot where it’s virtually guaranteed to be cancelled at the end of its third season.
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