I'm a big Dr. Who fan so my opinion may be a little biased! This is the first series of the most recent Dr. Who programmes, with Christopher Eccleston as the Dr.
He only did one series in this role, but was superb. I love his energy as an acto,r and he has that essential slightly mad appearance.
Of course we also have Billie Piper as 'Rose' and I really enjoy what she brings to the series.