After a few earlier experiments, BBV began regularly releasing audio dramas on CD in 1998, under the umbrella title "Audio Adventures in Time & Space". The mainstay of the CD line to begin with was a series starring Sylvester McCoy and Sophie Aldred (the Doctor/companion team from the 1987, 1988 and 1989 seasons of "Doctor Who") as a pair of wanderers in time and space named "The Professor" (McCoy) and "Ace" (Aldred) who so closely resembled the characters McCoy and Aldred had played on "Doctor Who" - even addressing each other by the same nicknames - that the BBC stepped in and their seventh outing, "Ghosts", consequently introduced a number of changes to the characters that made the resemblance somewhat less close, the main one being that the protagonists were now called "The Dominie" (McCoy) and "Alice" (Aldred).