There are already calls for them to return. Are they the new Sally Sparrow?

Referenced every time a new unknown female character is introduced...

I thought they'd all been in it before .

the green lizard woman - she's appeared before hasn't she ?

I can't keep track of all these characters

Same actress played Alaya and Restac in THE and CB, she played a different character here - same species.

The Silurian played the two female sisters last year, but she played a different character this time.

No, the actress playing the character has appeared before, but the character was a new one, so was Jenny.

The Silurian was from a different batch of them, who had been disturbed from their slumber by the drilling of the London Underground.

Same actress, different character. Silurians who are related look alike so Vastra is probably something like the great, great aunt of the two sisters she played last time.

I thought the the Silurian was the same character from the last series. There was a line the Dr said something like "When I 1st met you you were full of anger because your sister had been killed" So to me that ment it was the sister that was originally underground when the 1st one came above the surface. The female Silurian even mentioned about the drilling being misunderstood

Different name, different sister, different area, different drilling. Sorry!

Just when you think you have it all sussed LOL. Damn Stephen Moffat is god

the female soldier who switched sides to help them - have we seen her before ?

No but we will see her later (I assume)

Or we'll see her before, later.

Ow.
Gary