The BBC Press Office has now added the synopsis for The Sarah Jane Adventures Enemy of the Bane part one. The episode will follow The Temptation of Sarah Jane Smith part two and will be the final story of the series. You can see the synopsis below;

Gita vanishes and Sarah Jane encounters an unwelcome face from the past - Mrs Wormwood - as the children's drama series, produced by Russell T Davies, continues.

Now hunted by the Bane, Mrs Wormwood needs Sarah Jane's help to foil their plan to take over the galaxy with an ancient alien power. And Sarah Jane also needs help - from the Brigadier.

Gita is played by Mina Anwar, Sarah Jane by Elisabeth Sladen and Mrs Wormwood by Samantha Bond.

Enemy of the Bane part one will broadcast on the 1st of December at 5.15pm on CBBC and on the 8th of December at 4.35pm on BBC One.