Both Jonathon Morris and John Barrowman have appeared in Doctor Who (1963) and Doctor Who (2005). Jonathan Morris played Chela in Doctor Who: Snakedance: Part One (1983) and John Barrowman played Captain Jack Harkness, companion of the Christopher Eccleston and David Tennant incarnations of the title character and also in the spin-off series Torchwood (2007) (TV Series).
In an edition of the show in 1994. John Barrowman asked one of the contestants "Can you name the Doctor who assists Sherlock Holmes?" It foreshadows John Barrowman starring in the revived series of "Doctor Who" as Captain Jack Harkness, companion to the Christopher Eccleston and David Tennant incarnations of The Doctor. Steven Moffat, creator of the BBC series "Sherlock" took over from Russell T. Davies as the showrunner in 2010.