Doctor WhoThe BBC archives erase dozens more episodes of Doctor Who due to an ongoing space crunch and an impending change of video standard from 405-line PAL to 625-line PAL. Whereas the first round of tape-wiping in 1967 was targeted at episodes involving the first Doctor, this round marks episodes featuring the current Doctor, Patrick Troughton, for deletion. The fourth episode of The Tenth Planet – Hartnell’s swan song in the role of the Doctor – is erased at this time, as well as a curious scattershot selection of Troughton episodes.