Zoe:  Doctor , if we 've landed , where are we ?
Dr. Who: That is what I 'm trying to find out , Zoë .
Zoe: A rocket ?
Jamie: Hey , we 're just hanging in space !
Dr. Who: Well , we ca n't be !
Zoe: Well , let 's try and find a star we know .
Dr. Who: There we are . Oh ... What in heaven 's name ... ?
Jamie: Hey , what 's he up to ?
Zoe: He 's trying to climb aboard .
Dr. Who: Just a minute ... Just a minute ... Oh , this control is ... There we are . No , now that 's an ion - jet rocket of the twenty first century , but ... but ... this helmet , if I can ... There we are ! That 's not nearly so sophisticated . It 's certainly not later than nineteen sixty .
Jamie: Those letters on his helmet ?
Zoe: C - C - C - P.
Dr. Who: Of course !
Jamie: What ?
Dr. Who: Just a minute . Yes , I ... I think that explains it !
Zoe: Well , Doctor , what is it ?
Dr. Who: Well , it 's a ... it 's a flying machine , designed by a gentleman by the name of Leonardo Da Vinci in about umm _ fifteen hundred _ .
Jamie: Well , what 's it doing up here ?
Zoe: Doctor , where are we ?
Dr. Who: We 're in a museum !
Jamie, Zoe: A what ?
Dr. Who: A space museum ! Look ! There you are . A balloon ... That 's a transport plane . Now , those initials , they stand for Russia . That 's Gagarin , the first earthman in space . Look . Come on , let 's have a look round , shall we ?
Jamie: Right .
Dr. Who: Wait for me !