Sarah Jane has 40 minutes to stop Sontaran Commander Kaagh from destroying Earth using its orbiting satellites, while Chrissie finds out the truth about aliens from Alan - but will they be in time to save Maria?

New girl Rani is haunted by a sinister clown - could it be linked to the recent disappearances of several local children? When Clyde's friend also goes missing, Sarah Jane and the team are drawn towards a bizarre circus museum, and an old legend - has the Pied Piper come to Bannerman Road?

Luke is taken by Spellman and Sarah Jane has to confront her oldest fears to save him