[SPOILER ALERT: Read on only if you have already watched Thursdays season 4 finale ofOrphan Black.]

Bad Rachel is back in a big way.

Sarah wasnt the only one in danger.

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Credit: Ben Mark Holzberg/BBC AMERICA

It wasnt all bad news, however.

ENTERTAINMENT WEEKLY: What can you tell us about this P.T.

Westmorland character who literally wrote the book on Neolution over a century ago and apparently is still around?

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Ken Woroner/BBC America

GRAEME MANSON:Apparently, the man never died.

And now Rachel is looking at the eye orthroughthe eye, perhaps.

Obviously this is going to be a large part of our mystery for next year.

The man wrote the book in what, 1870 or 1880?

How is he still alive?

We have ourIsland of Doctor Moreaufetish onOrphan Black, as well as our Mary ShelleyFrankensteinand our vintage science-fiction respect.

And again, were setting the table for next year.

Who are these people?

And what are they doing there?

That will be pretty fun to figure out.

[Laughs]Got any ideas?

I guess that remains to be seen.

We had to keep this secret of Delphines death going all year.

Its not even a secret.

We had to flat out lie!

You guys are used to that.

But youre right, the truth of the matter is that Evelyne Brochu is a busy actor.

We always wanted to continue to tell the story of Delphine and Cosima.

We did the best job that we could with what we had.

Well do the same thing again next year.

So does Cosima have the cure now that she stole the Leda/Castor genetic union?

Is she finally in the clear?

By her own hands and Susan Duncans she has a viable gene therapy now.

So, yes, Cosima has a cure, or at least a therapy.

Lets remember that this is experimental science.

Its experimental science in the real world and its experimental science onOrphan Blacktoo.

So we cant breathe easy yet, is what youre telling us.

Is it fun for you all when Rachel breaks bad?

Yeah, we all like Rachel breaking bad.

And, you know, Tatiana does too.

And then to use them to surprise the audience.

Why keep them apart this time?

We let Sarah go to Iceland.

We let things by okay.

We wanted to probably pick up next season on the run again, but well see about that.

Krystal is so much fun.

Do you see her becoming at least a semi-regular presence in season 5?

Yeah, I do.

Or will she or wont she figure out shes a clone?

And thats a nice question for us to keep asking next year.

It hasnt worn itself out.

Shes just so much fun.

I love seeing her with Felix.

I like that she kind of likes Art.

What is the status of the Castor clones?

What is the future for Ira?

Ira is still ticking.

We like Ira and Im sure Ari Millen is going to be back next year.

Weve also left a Castor or two out in the wind.

Where are you on breaking story on season 5?

How deep are you into that?