This well researched and insightful documentary about producer John Nathan-Turner looks at his career with a special emphasis on his time at Doctor Who which he worked on throughout the 1980s until the show went on hiatus following the Season 26 story ‘Survival’. Featuring rare footage and commentary from those who knew him and worked with him, Showman is a fascinating look at the life of a troubled showman with lots of stories to tell.
| Actor | Role |
|---|---|
 John Nathan-TurnerHimself (archival footage) | Himself (archival footage) |
 Peter DavisonHimself | Himself |
 Colin BakerHimself | Himself |
 Janet FieldingHerself | Herself |
| RRichard MarsonHimself | Himself |
| RRoy HawkesfordHimself | Himself |
| JJeffrey RichardsHimself | Himself |
| AAnita GrahamHerself | Herself |
 Christopher H. BidmeadHimself | Himself |
 Eric SawardHimself | Himself |
 Andrew CartmelHimself | Himself |
 Ian LevineHimself | Himself |
 Nicola BryantHerself / Peri (archive footage) | Herself / Peri (archive footage) |