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?
In this weeks VORTEXTRA... Discuss
4.4: The Sontaran Stratagem, Rate the Episode and check out our Episode Guide entry for it. View our facts about
Cloning, take part in our Quiz for the episode and
check out Teaser #4 for the forthcoming
DWO Role Playing Game.
NEXT TIME... VORTEXTRA explores
4.5: The Poison Sky.