There's some faces to treat fans old and new in the first part of Sarah Jane's second season finale. Here is who to look out for:
Sir Alastair Gordon Lethbridge-Stewart - also known affectionately as The Brigadier - is back, nearly 20 years after his last appearance in the Whoniverse.
UNIT also feature prominently in the episode.
Mrs Woomwood and the Bane make a return.
Rani's mother is taken away from her.
Sontaran Commander Kaagh is also involved in a fiendish plot.
