Check out a preview from Season 4 of THE SARAH JANE ADVENTURES, which features 11th Doctor, Matt Smith. The new season premieres on Monday October 11th on CBBC (time TBA).
In addition you can also watch a clip from episodes 5 and 6 titled Death of the Doctor written by Russell T. Davies. Here is the synopsis:
Episode Synopsis: When the Doctor is declared dead, old companions Sarah Jane and Jo Grant meet for the very first time, and join forces to discover the truth. As an interstellar conspiracy gathers around UNIT HQ, Clyde finds that he holds the fate of the Time Lord in his hand - quite literally. (Source: Blogtor Who)