Originally Posted by TimCypher:
“So, is this the lowest audience count since the start of the series after all?
If it's not, I think that gives the show something to be proud of - that it held its own despite an incredibly popular event spectacle on the other side.
Regards,
Cypher”
From the news article "The rating is the lowest since The Satan Pit in 2006, which got 6.1 million watching."
Impossible Planet got 6.32m, and SitL is sandwiched between them at the bottom of the charts.