Original sentence: In September 2009 there will be a new set of adventures, consisting of 6 two parters, equivalating in 12 episodes in total.It has been confirmed full cast is returning, with Maria and her Dad still in America.The Doctor played by David Tennant will be appearing in Episodes Five and Six, believed to be Sarah-Jane's wedding.The Slitheen are appearing for the finale along with the Blathareen along with a second return of the Trickster.With K9 appearing in 6 episodes