Since 1994, the character has also appeared in various novels from Virgin Publishing and BBC Books, set between televised adventures during his particular era of the programme. One BBC Books novel, "The Face of the Enemy" by David A. McIntee (1998), picks up the story of Ian and Barbara, now married to each other, in the early 1970s, the two of them collaborating with the Doctor's colleagues at UNIT and his enemy the Master when Ian is hired as the Third Doctor's temporary replacement while the Doctor is taking a trip away from Earth. In this book, they have a young son named John. Many of the novels mention a 1980s pop star named Johnny Chester or Johnny Chess, intended to be the same character. Chess is idolised by the Seventh Doctor's companion Ace and has apparently been romantically involved with the Fifth Doctor's companion Tegan.