The one where Sarah discovers there's another traitor in their midst...
Captain Yates - the man directly responsible for rendering the Doctor's stun gun inoperable and endangering his life - leaps to the rescue, partially through natural military heroism, but probably much more through guilt. When he reports back to his new superiors at Operation Golden Age, he stresses just how upset he is that the Doctor was almost killed due to the sabotaging of the stun gun, but come on Mike... it's completely your fault! When Mike suggests to Butler and Whitaker that perhaps they should let the Doctor in on their plans as he might be sympathetic to them, that's when you realise Mike is somewhat out of his depth with these guys. Whatever Operation Golden Age's full intentions are, Mike seems naively unaware of just how far they're willing to go to achieve them...
And anyway, as if the Doctor would even contemplate the sanity of Operation Golden Age. It's transporting rampaging killer monsters millions of years through time to central London, for heaven's sake! That's just not sane, in anybody's book.






