The 31st episode of The Sarah Jane Adventures airs on CBBC, starring Elisabeth Sladen (Doctor Who). 
Clyde and Rani make an amazing discovery while exploring the catacombs in which Erasmus Darkening reportedly conducted his alchemy experiments, finding advanced electronics. But it soon becomes apparent that Darkening isn’t the only “ghost” on the premises – and not all of them are under Darkening’s power. In fact, some of these apparitions may prove to be more than willing to help in the fight against Darkening’s power. But will help from the other side be enough? Sarah still can’t bring herself to believe in ghosts, despite the mounting evidence.
written by Phil Ford
directed by Alice Troughton
music by Sam Watts / title music by Murray GoldCast: Elisabeth Sladen (Sarah Jane Smith), Tommy Knight (Luke), Daniel Anthony (Clyde), Anjli Mohindra (Rani Chandra), Floella Benjamin (Professor Rivers), Donald Sumpter (Erasmus Darkening), Callum Blue (Lord Marchwood), Adam Gillen (Toby Silverman), Amelia Clarkson (Elizabeth Marchwood), Rhys Gear (Joseph Marchwood), Tony Boncza (Mr. Scriven)
Notes: Donald Sumpter would go on to become the latest face of Rassilon in the Peter Capaldi era of Doctor Who.
LogBook entry by Earl Green