As part of the sixtieth anniversary celebrations of Doctor Who, David Tennant time-travels back through the BBC archives to tell the story of the Doctor’s classic era, with a selection of rarely seen interviews and clips covering William Hartnell’s first incarnation right through to the seventh Doctor, Sylvester McCoy. 　　On the way, David compares some of his own experiences with the actors who came before him and shares special archive moments that reveal, amongst other things, how to film a regeneration, which actor was a master of modern gadgetry - including a collapsible caravan - and what the factors were that helped to decide how a Doctor selects his own individual and distinctive costume.