- Jodie Whittaker (The Doctor)
- Mandip Gill (Yasmin 'Yaz' Khan)
- John Bishop (Dan Lewis)
Episode: The Ultimate Companion
Air Date: 2014-08-17
Runtime: 45 min
Peter Davison recounts what it takes to be the ultimate companion. Meeting with cast and crew past and present, Peter travels the UK and the USA in search of the answers.