The 135th episode of Doctor Who airs on the BBC. This is the first episode of the series to introduce a new incarnation of the Doctor, played by Patrick Troughton. To ensure that audiences don’t defect from the series due to the change of lead actor, producer Innes Lloyd brings back the Daleks for the second Doctor’s first outing. This episode is now missing from the BBC’s archives.

The second in NASA’s series of
The ninth 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.
The 66th episode of Irwin Allen’s adventure series Voyage To The Bottom Of The Sea airs on ABC, starring Richard Basehart and David Hedison. Hugh Marlowe guest stars.
The 38th episode of Irwin Allen’s science fiction series Lost In Space premieres on CBS, starring Guy Williams, June Lockhart, and Jonathan Harris. Malachi Throne (Star Trek, Batman) and Ted Cassidy (The Addams Family) guest star.
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BBC2 airs the 17th episode of science fiction anthology series Out Of The Unknown. Written by Hugh Leonard, the story stars Nigel Stock and Caroline Blakiston (Return Of The Jedi). This episode no longer exists in the BBC’s archives.
The ninth episode of Irwin Allen’s science fiction series The Time Tunnel airs on ABC, starring James Darren and Robert Colbert. Marcel Hillaire, Whit Bissell, and Lee Meriwether geust star.
The final mission of NASA’s Gemini program, Gemini 12 lifts off with Jim Lovell and “Buzz” Aldrin aboard. Over their three-day flight, the last two-man American astronaut crew until the early Space Shuttle flights finally demonstrates improved spacewalk techniques, with handholds having been added to the Gemini capsule’s exterior, and pre-launch training conducted underwater in weighted spacesuits. Aldrin performs a two-hour spacewalk without overexerting himself, a first for the American space program. Gemini 12 splashes down, having accomplished all of the Gemini program goals mere weeks ahead of the first launch window for Apollo 1.
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