‘Sky (Part One)’ airs on Monday 3rd October on CBBC and sees Sarah Jane Smith discover that somebody has left an unexpected gift on her front doorstep – something with powers that are as astonishing as they are deadly…

> Buy the Series 4 boxset on Amazon.

Elisabeth Sladen as Sarah Jane Smith and Tommy Knight as Luke…

Daniel Anthony as Clyde and Anjli Mohindra as Rani…

Sinead Michael as Sky and guest star Christine Stephen-Daly (Casualty) as Miss Myers…

Watch the Series 4 trailer…