the funniest thing about actors who play multiple characters in dw is that sometimes they explain it and sometimes they just don't bother. like the twelfth doctor looks exactly like that one dude he met in pompeii two regenerations ago because he chose that face on purpose. martha looks exactly like some random girl who died at canary wharf because they're cousins. there are multiple distinct characters who look exactly like clara because she entered the doctor's timestream and all that weird sci-fi nonsense. but sometimes it's just like... the second doctor has an evil mexican doppelganger for no reason. there's a weird guy from alabama in the 60s who looks exactly like steven for no reason. there's like three different guys who are all mark gatiss
