Martha Jones summons the Doctor back to modern-day Earth, but an old enemy lies in wait.
The Sontarans activate their masterplan and begin to poison the whole of planet Earth.
Earth is left defenseless, with a traitor in their ranks. And as interplanetary war edges closer, the Doctor has to fight to keep both Martha and Donna alive - but will he have to make the ultimate sacrifice?
EPISODE REVIEW - PENDING
In the meantime, hooray, now Knighted, Brigadier Alistair Gordon Lethbridge-Stewart Stewart is mentioned (stranded in Peru) and Rose Tyler appears (don't blink!).
An impressive second episode after the lacklustre first episode.
Things to look out for...
DOCTOR WHO FOLKLORE Rose Tyler appears in this episode - blink and you miss her.
DOCTOR WHO FOLKLORENow Knighted, Brigadier Alistair Gordon Lethbridge-Stewart is mentioned (stranded in Peru).
DOCTOR WHO FOLKLORE The UNIT airship, VALIANT appears in this episode as a glorified air-fan to dispel the smoke discharge.
DOCTOR WHO FOLKLORE The enemies of the Sontarans, the Rutans, are mentioned. The two alien races have been at war for 50,000 years.
DOCTOR WHO FOLKLORE After donning his gasmask, the Doctor says "Are you my Mummy?" to Mace. This refers to Steven Moffat's THE EMPTY CHILD.
CONTINUTY ERRORS Looks perfect.
DOCTOR WHO CONFIDENTIAL documentary
Review - MATTHEW WALTER
CAST - TBC
Rupert Holiday Evans
PRV. STEVE GRAY
SERIES 4 Guest Star the legendary
BERNARD CRIBBINS as WILFRED MOTT
MAIN CREDITS - TBC
With thanks to the BBC National Orchestra of Wales