He was a Time Lord who fought evil beings called Daleks and travelled in a Tardis.
That was a police phone box which was magically bigger inside than out.
It was on TV from the 1960s till 1989.
But Buffy didn't do too shabbily: four characters from the show are in the top 10.
Characters from Farscape and Star Wars were also voted for by sci-fi fans.
The top ten: