down, he accepted the post of producer for season 18, which would also become the last to feature Baker as the Fourth Doctor. Due to Nathan-Turner's relatively young age at 33 and lack of previous experience as a producer, the BBC brought former Doctor Who producer Barry Letts back to the series to act as executive producer for his first season. Nathan-Turner's experience of working with Graham Williams helped form his views on the future direction of the series. He strongly felt that people working on the programme (especially Williams, script editor Douglas Adams and star Tom Baker) had stopped taking the show seriously: it was parodying science fiction, rather than presenting serious storylines. He also believed that Williams had allowed Baker too much influence on the show's direction, rather than confronting Baker over his increasingly comedic acting style. Nathan-Turner, together with new script editor Christopher H. Bidmead, decided Baker's creative influence needed to be reined in. Nathan-Turner decided on a new broom approach, and instituted sweeping changes: replacing the arrangement of the theme music which had run throughout the 1970s with a more contemporary electronic arrangement by Peter Howell, and introducing revamped opening titles (featuring a new photograph of Baker, replacing the original taken in 1974) and a new closing credit sequence. Nathan-Turner also dispensed with the services of long-time composer Dudley Simpson, who had provided the incidental music for the majority of the Doctor Who serials of the 1970s and all of the Williams era stories. With Simpson departed, the Doctor Who incidental music under Nathan-Turner's stewardship would be provided by electronic composers including Peter Howell, Paddy Kingsland, Malcolm Clarke, Roger Limb, Jonathan Gibbs, Keff McCulloch, and Mark Ayres. As Nathan-Turner had no writing or script-editing experience, the choice of the stories for production was largely left to Bidmead. This at once led to difficulties, with the second story to enter production, Meglos (1980), suffering from all the problems which Nathan-Turner had identified in the show's scripts under Graham Williams (a lack of realism, an over indulgence in comedy). Nathan-Turner's first major story influence was in bringing back the Master, but the details of this he left to Bidmead. At the end of Nathan-Turner's first season in charge, both Bidmead and Letts left their posts on the series along with Tom Baker, and Lalla Ward, who had played companion Romana, also left partway through the season in Warriors'