Spearhead from Space
Caroline John as Dr Liz Shaw and Jon Pertwee as the Doctor in a publicity shot for Spearhead from Space (1970).
There’s an ambitious set of challenges that come with introducing a new Doctor, and they were never greater than with Jon Pertwee’s first story. Spearhead from Space had to introduce both a new regular cast and a new format for the series, which saw the Doctor exiled to Earth. And, of course, it gave viewers something they’d never seen before: Doctor Who in colour.