Writer Paul Cornell is a Doctor Who (1963) fan and some of the guest characters in this episode have names taken from the series. Derek Moberley and Arnold Keeler were characters in Doctor Who: The Seeds of Doom: Part One (1976), while Petra Sutton is an amalgam of the characters Petra Williams and Greg Sutton from Doctor Who: Inferno: Episode 1 (1970), a serial which featured a romantic subplot between the two characters.
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