By the end of Tom Baker's tenure, the TARDIS crew had grown from the usual one companion to three. This featurette examines the reasons behind this change of direction.
| Actor | Role |
|---|---|
| GGeorge WilliamsNarrator | Narrator |
 Christopher H. BidmeadNot listed | Not listed |
 Tom BakerNot listed | Not listed |
 Peter DavisonNot listed | Not listed |
 Sarah SuttonNot listed | Not listed |
| JJohn BlackNot listed | Not listed |