What makes this potential ally even more intriguing?
She is one of them.
(and is played, like all the other clones, by Tatiana Maslany).

Credit: Ken Woerner/BBC America
She has vital information, but getting her to share it is another matter altogether.
We spoke to co-creators John Fawcett and Graeme Manson to get the scoop on the new addition.
ENTERTAINMENT WEEKLY: Okay, gentlemen: What can you say about this new clone?

Ken Woerner/BBC America
GRAEME MANSON:Her name is M.K.
A mysterious name for a mysterious character.
FAWCETT:And very elusive.
And quite highly skilled and very smart.
Whats very cool about it is this is a clone who has been self-aware for some time.
MANSON:Yeah, for longer than any of us.
So she is this really fun new character that were going to see in season 4.
FAWCETT:Its a little bit of both.
Shes very security conscious.
She knows more than Sarah does so she knows how dangerous the whole thing is.
But this girl is very unwilling.
MANSON:Yeah, shes a reluctant source.
So what do you want to say about the sheep mask?
MANSON:You get it?
FAWCETT:Dolly the sheep.
MANSON:We had a lot of fun going through masks to figure this one out.
We saw about 5,000 masks.
FAWCETT:We wanted it to be spooky but kind of childlike at the same time.
We wanted a little balance.
And for moreOrphan Blackintel, follow Dalton on Twitter@DaltonRoss.
A version of this story appeared inEntertainment Weeklyissue #1397/98, on newsstands Tuesday.