The Third Doctor’s era marks one of the most significant changes to the status quo in the show’s long history. No longer a wanderer in the fourth dimension, this Doctor is stuck in one time and place for the majority of their tenure and have to deal with things no other incarnation has had to deal with, not on a consistent basis at least. They’re surrounded by an extended cast of characters beyond that of their chosen travelling companions and, possibly most frightening of all, they have to get a job! These are the days of UNIT and cementing the Doctor’s role as Earth’s defender.