3. Imelda Staunton (The Interface)
Yes, it's Professor Umbridge. She made it into Doctor Who and you didn't even realise it. Believe it or not, Imelda is one of the few Oscar nominated actresses to appear in Doctor Who. She may have traumatised Hogwarts for a year and reminded you of that one teacher who was especially mean but she's a brilliant actress nonetheless. In The Girl Who Waited there was a computer interface for which she lent her voice. That probably explains why this episode gave so many people the creeps, then. It should be pointed out that she was also awarded the OBE in 2006 for her services to drama, and it doesn't get much more dramatic than an adventure with the Doctor. She has been a staple of British film and television for years and shows no signs of stopping, which may be a bit disconcerting if you're still terrified of Umbridge. And who isn't? Let's hope Imelda gets the chance to appear on screen in Doctor Who one day, too.