The 169th episode of Doctor Who airs on the BBC. This is the second Doctor’s second and final encounter with the Daleks, though it is the last Dalek story (and, barring a brief glimpse on a viewscreen in 1969’s The War Games, the last Dalek appearance) for the remainder of the 1960s. Dalek creator Terry Nation withdraws the BBC’s rights to use the Daleks in Doctor Who, intending to launch the Doctor’s enemies in their own series, possibly in America. The prospective Doctor-less Dalek series never comes to pass, and the Cybermen reign as the second Doctor’s most enduring recurring enemies as a result. The Daleks do not headline a Doctor Who story again for five years. This concludes the fourth season of Doctor Who, the show’s first post-regeneration season, and marks the end of producer Innes Lloyd’s tenure as showrunner. This episode is now missing from the BBC’s archives.