Hard science: What Christopher Bidmead wanted to reintroduce to Doctor Who. Judging from the script to Logopolis, hard science consists of millions of chanting monks in a city made to look like a brain, chanting block transfer mathematics codes in order to counteract entropy, while the ghost of someone’s future self tells him the future in order to cause it.
From Andrew Hickey’s excellent lexicon for the 1981 Doctor Who serial ‘Logopolis’, in which Tom Baker’s Doctor (cheekily designated here as the twelfth incarnation) regenerates after a fatal fall from a radio telescope. (Or, as Hickey puts it in his entry on gravity:
if you place a Time Lord with an approximate mass of 70kg at the top of a radio telescope, say Jodrell Bank, 89m above a planet with mass 5.972×10^24kg, and then have him let go, he will hit the planet a little over three seconds later.)
‘Logopolis’ and its sequel ‘Castrovalva’ seem to me to be stories that could only be told within the world of Doctor Who, concerned as they are with the manipulation, destruction and reconstruction of the show’s unique central icons: the Doctor and the TARDIS. One could go further and say that another of the show’s unique qualities is its acceptance of and dependance upon this same process of reconstruction.