The following six two-part episodes will air this autumn on BBC One and the CBBC channel.
* S04E01/E02: The Nightmare Man by Joseph Lidster
* S04E03/E04: The Vault of Secrets by Phil Ford
* S04E05/E06: Death of the Doctor by Russell T Davies
* S04E07/E08: The Empty Planet by Gareth Roberts
* S04E09/E10: Lost in Time by Rupert Laight
* S04E11/E12: Goodbye, Sarah Jane Smith by Gareth Roberts and Clayton Hickman
In April it was announced that Russell T. Davies would return to the Whoniverse with Death of the Doctor. Details have been sketchy although what has been confirmed is that joining Matt Smith’s Doctor will be Third Doctor companion Jo Grant (Katy Manning) in an episode which features a secret base beneath Snowdon and a new alien race called the Shansheeth, who are described as â€˜vulture undertakersâ€™.
For the first time in the series the group of Sarah, Luke, Clyde and Rani, will travel to an alien world – breaking the Judoons confinement of Rani and Clyde to Earth.
The final episodes will also see the return of The Trickster last seen in The Wedding of Sarah Jane Smith which featured the Tenth Doctor.
Anyone concern at the title of â€˜Goodbye, Sarah Jane Smithâ€™ need not panic as a fifth series has already been commissioned.
It is also rumoured that series four will see Luke leave the fold, to be replaced by a younger girl though being as he is Sarahâ€™s son, it probably wonâ€™t be for long. His disappearance maybe at the hands of the Nightmare Man who is played by the one-time Davros, Julian Bleach.
Other guest stars include: Cheryl Campbell (Pennies from Heaven, Spooks, Peep Show) will play Ocean Waters in the Vault of Secrets, Cyril Nri (This Life, Survivor) plays a shopkeeper in Lost in Time and Julie Graham (Survivors and At Home with the Braithwaiteâ€™s with Fifth Doctor Peter Davison) will play Ruby White in the finale Goodbye, Sarah Jane Smith.