I'm trying to think of which characters in "Doctor Who" have met themselves by virtue of time travel. So far I've got:
- The Doctor (obviously) - multiple times.
- The Master - John Simm's Master met Missy, played by Michelle Gomez, in the Twelfth Doctor story "The Doctor Falls".
- The Brigadier - his self from 1983 met his self from 1977 briefly in the 1983 Fifth Doctor story "Mawdryn Undead".
Any others? Note that I'm looking for characters who meet their actual selves through time travel, not who meet a duplicate of themselves. Also, I'm only considering major/recurring characters.