When an old enemy, Androvax the Veil, returns to Earth, the gang face a dilemma, as the alien-busting adventure series continues. Should they trust him – or does the legendary Vault hold an even greater terror?
A second threat then arises when android guardians threaten to destroy anyone who uncovers their secrets.
As the battle between Sarah Jane, Androvax and the androids reaches its climax, Rani has to save her own mother from being caught in the crossfire. But, as the Vault opens, with the destiny of the entire Veil species at stake, is it too late to save anyone?
Elisabeth Sladen stars as Sarah Jane Smith alongside Tommy Knight as Luke, Daniel Anthony as Clyde, Anjil Mohindra as Rani Chandra, Mina Anwar as Gita Chandra and Mark Goldthorp as Androvax.
This two-part adventure is repeated on BBC One at 4.30pm on Wednesday 20 and Thursday 21 October.