Watch the first ever clips from the new season of Doctor Who. Two clips for each of the Doctor's mood swings. Watch Matt Smith twist from playful to deadly serious in mere seconds!

What did you think? Has River Song grown on you yet? Hope so, because she's not going anywhere anytime soon. The second clip is actually a marvelous look at the chemistry between these two time travelers in season six.

If you want more, check out our spoiler free review of the first two episodes. The first episode, "The Impossible Astronaut," will air on April 23rd on BBC America, and "Day of the Moon" will appear on the 30th.