The Sontaran Stratagem

Episode Title:
The Sontaran Stratagem

Written By:
Helen Raynor

Starring:
David Tennant - Doctor
Catherine Tate - Donna Noble
Freema Agyeman - Martha Jones

Alien:
Sontaran

Air Date:
26th April 2008

Synopsis:
Martha Jones summons the Doctor back to modern-day Earth, but an old enemy lies in wait, as Russell T Davies's Bafta Award-winning time-travelling drama continues. With the mysterious ATMOS devices spreading across the world, Donna discovers that even her own family is not safe from the alien threat - but is it too late to save them?