Series 4 episode 4-overnight ratings.posion sky spoilers

the picture above was made by me.
The Overnight ratings for 4.4 the sontaran startagem or in.

Overnight Ratings show that the episode achieved 6.4 Million viewers with a 35.2% audience share

Doctor who was the second most watched most watched programme on saturday.
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Now for the poison sky spoilers
These are from Digital Spy, and two of them are red herrings

• Donna's mother Sylvia wields an axe.
• A jellyfish-like Rutan army makes an appearance (via a Sontaran flashback).
• The Sontarans steal the TARDIS.
• UNIT prepare to launch a nuclear strike.
• Donna kills a Sontaran via the probic vent and booms out "back of the neck!"
• The Valiant is put to good use by Colonel Mace.
• The current whereabouts (and official title) of Alastair Lethbridge-Stewart are revealed.
• Donna punches the real Martha in the face - believing her to be the clone.
• Luke has devised a mating programme for his genius recruits.
• The Doctor puts on a gas mask to combat the poisonous sky and squeals "are you my mummy?"