kham wrote:Based on that criteria, you have just parsed the list down to nonexistence. Or some utterly obscure and forgettable character over 50 years of episodes? Good luck
+1
Although saying "over 50 years of episodes" is a bit disingenuous, the idea that a character who appears, ad a maximum, two times in over 800 episodes, not including seasonal specials in the reboot, strikes me as... difficult. And as previously noted, the definition excludes some pivotal-yet-rarely-seen essential characters such as Davros. What significant development could occur in 0.002% of the show's run?
The characters mentioned so far serve simply as a foil to pose a challenge to either the Doctor or his companion de jour.
Now, were we to relax the definiton a bot, I'd start in a derivative manner and submit Davros. Then John Lumic. Finally, I'd offer Rassilon. Each of these minor characters spawned one of the Dr's nemeses. Sadly, each appeared more than twice, excluding them from consideration.
I suppose the two council Timelords who opposed Rassilon, whom he dubbed "the original weeping angels," would qualify, had they been given names.