Incidentally, by my reckoning, if you started from The Christmas Invasion, you've so far met... Rose, Mickey, Donna, Martha, and Captain Jack Harkness. In that order, I think? How are you feeling about all of the so-far companions? Got a favourite yet?
And, come to think of it, the pre-titles to Utopia must've been dead weird for you! How quickly did you work out what Captain Jack was all about?