sentences:  The BBC released a completed version of "Shada" in 2017, with missing dialogue newly recorded by the original cast, using the same audio equipment employed in the initial shoot, and animated by the team that undertook the animated version of the 1966 serial "The Power of the Daleks".Previous attempts to present the story include a narrated reconstruction for BBC Video; a re-imagined audio play by Big Finish Productions, also offered with basic Flash imagery on BBCi and the BBC's "Doctor Who" website; and a novelisation by Gareth Roberts, based on the latest shooting scripts, with the author's own additions.The Fourth Doctor answers a distress signal from Professor Chronotis, a Time Lord posing as a professor at St. Cedd's College, Cambridge who loaned a Gallifreyan tome to his student Chris Parsons.