Doctor and other members of the cast. The first of these, in December 1982, starred Peter Davison and co-starred Anthony Ainley (the Master) and the actress Sandra Dickinson (who at that time was Davison's wife, but later guest starred in Doctor Who with Jon Pertwee, on Ghosts of N-Space). During his time producing Doctor Who, Nathan-Turner wrote two books about the programme, Doctor Who: The TARDIS Inside Out (1985) and Doctor Who: The Companions (1986). Contentious decisions Criticism of his production decisions was wide-ranging, from employing too many back-references (thereby limiting the scriptwriters, and confusing the casual viewer), to employing excessive violence in Colin Baker's 1985 season, to his hostility to using writers and directors from the show's past, and in the casting of guest stars best known for roles from light entertainment rather than from drama (including Rodney Bewes, Beryl Reid, Richard Briers, Ken Dodd and Hale and Pace). However, Patrick Mulkern of Radio Times argued that "John Nathan-Turner should be applauded for enticing big-name guest stars and his 'stunt casting' of actors in wildly inappropriate roles often pays off", although he cited Briers as an example who was "shockingly bad". He was criticised for the casting of companions purely as gimmicks: the character Tegan Jovanka (an Australian air-stewardess played by Janet Fielding) was introduced solely to curry favour with viewers in Australia; whilst Peter Davison reported that the American character Peri Brown (played by Nicola Bryant) was introduced only in an attempt to endear the show to American viewers. Davison has said Nathan-Turner's decision to introduce an American companion merely to appeal to the American market was one of his reasons for leaving the show, as he felt it was wrong for the series, but led to his realising that – despite being its star – the direction of the series was out of his control, and he could do nothing about decisions he disagreed with. In 1985, BBC1 controller Michael Grade enforced an 18-month hiatus on Doctor Who, publicly criticising the series as tired, violent and unimaginative. In 1986, after the series had returned (with fewer episodes in the season), Grade insisted that Nathan-Turner replace the actor he had cast as the Sixth Doctor, Colin Baker, as a condition of it continuing. According to an interview with Peter Davison in 2018, Baker was "the victim" because "the power structure in the BBC had changed and they didn't