Cambridge Previsited ( short story ) Publisher ' s summary . The First Doctor visits an old friend — who he hasn ' t met before ! A new story by " Doctor Who Magazine " prize - winning writer Karen Dunn . Illustration by Paul Vyse . Plot . Professor Chronotis is briskly walking through the campus of the University of Cambridge , reflecting on his choice to live on Earth for the last few centuries . He crosses a courtyard and enters the University ' s library . As he strolls through the library , he uses his mental powers to help students working on their assignments to correct their errors . He is then approached by an elderly man in check trousers and a black cape , who he instantly senses as another Time Lord . In fact , Chronotis is sure he has met this Time Lord before . The man scolds Chronotis for being late . Chronotis tells the man , who he now realises is the Doctor , that the note he received telling him to " meet me in the library fifteen minutes ago , " didn ' t give him much time to get ready . The Doctor criticises the professor , telling him that he should have used his TARDIS to get there early . After an awkward few seconds , the Doctor shakes Chronotis ' hand , saying , " Professor Chronotis , I presume ? " Suddenly Chronotis panics , realising that this is an earlier version of the Doctor than the one he met four years ago . This meeting could cause irreparable rifts in the time lines ! Chronotis takes the easy way out and says , " Have we met ? " To his relief , the Doctor responds that he only knows of Chronotis from stories told on Gallifrey . The two begin having a pleasant conversation , which is brought to a swift end when Chronotis accidentally asks how " that young journalist " was doing . He blames the mistake on his old age and quickly changes the topic by asking if the Doctor has read " Treasure Island " . It is at this point that the Doctor decides that Chronotis is obviously going senile . Seeing that the Doctor has his mind on other things , Chronotis changes the conversation topic again , this time asking if the Doctor has settled on Earth . The Doctor tells Chronotis that he did in " a few years time " , but his current visit is a flying one . Chronotis acts disappointed , saying that he had hoped to have a like mind to talk to . The Doctor is offended , he picks up a book off the shelf and recommends Chronotis read it to see humanity ' s potential . Chronotis looks at the book and reads the title : " The Time Machine " . He exclaims , " Oh yes , you mentioned that this was a good one ! " Luckily , the Doctor had begun walking away from Chronotis after giving him the book and did not hear him . Chronotis catches the Doctor before he can leave the library and asks him to visit again . The Doctor leaves the building , saying , " I ' m afraid only time will tell ! " Chronotis collapses and mutters , " Never again . Oh please , Rassilon , never again ! " Later that day , while Chronotis is out buying milk and sugar from a late - night shop , the Doctor ' s TARDIS materialises in Chronotis ' study . After returning to the Ship , he had realised that he had never actually read " Treasure Island " , so has decided to return to borrow a copy from Chronotis for the evening . The Doctor looks out into the darkness of the unlit study , pleased that he had made an accurate short trip in the vortex . Leaving his companions sleeping in the TARDIS , he steps out into Chronotis ' study with an everlasting match . He finds " Treasure Island " in one of the bookcases and takes it ; in its place , he leaves a copy of " The Time Machine " . The Doctor says out loud , " Fair exchange is not robbery , hmmm ? " Hearing a door outside Chronotis ' rooms slamming , the Doctor darts into the TARDIS and quickly dematerialises . Next to " The Time Machine " on the shelf sits a thick brown book : " The Worshipful and Ancient Law of Gallifrey " .