Dr Who is known worldwide. It's been going since 1963.
Some Americans like it. But I don't think you'll like the new series which is basically fucking crap.
The Doctor is played by Chris Eccleston who is shit in the role.
He is so shit, he quit after ONE episode. The companion is played by an ex pop singer called Billie Piper. She's okay, and her eyebrows are soooo sexy. The best thing about her, actually...
Check this link out dudes, if you're interested:
http://www.bbc.co.uk/doctorwho/