The collection marks the 50th anniversary of sci-fi show Doctor Who, with all 11 Doctors getting their own first class stamp.
Four of the show’s most notorious villains, including the Daleks and the Cybermen, star on the second class set.
The show first ran from 1963 to 1989. A successful revival returned it to Saturday night schedules in 2005.
Andrew Hammond of the Royal Mail said the commemorative selection “pay tribute to the brilliant actors that have played the Doctor over the years, as well as the adversaries that helped make the show so popular”