2B or Not 2B

When Jo Martin’s Doctor was introduced in “Fugitive of the Judoon” some thought that she could be what fans refer to as Doctor 2B. Since the regeneration from Patrick Troughton to Jon Pertwee was never shown on film, some fans believe that it is possible that there was a version of the Doctor between the two. This theory has now been disproven, but let’s discuss the other possibilities of Doctor 2B.