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ENTERTAINMENT WEEKLY: You recently announced that this is your last season.

You never know whats going to happen with the show.

Doctor Who S10 Ep6 Extremis

Credit: Simon Ridgway/BBC America

Basically where I was coming from was ifPeters goingandStevens goingthen Ill probably be going to.

But you just never know.

Youve played her for three seasons now.

She can do or say or be any way she wants to be.

Theres a kind of discombobulating energy around her that is strangely attractive in a way.

The strength of that is the fact that shes very uncensored.

Obviously, as it suggests, it tops and tails the actual script.

So most of the time that ends up on the cutting room floor.

But some of it does make its way to the final cut.

Its like he has my voice in his head.

But shes a woman whos definitely wearing the pants.

From a female point of view, I describe her as having a fragile hostility.

Shes just like a bored cat.

Had you watched previous performances of people who had played the Master as you were prepping for the role?

I really wanted to turn up completely fresh.

I didnt want to start competing or imitating anything that had gone before.

So my blind ignorance, in that sense, worked for me.

Because being a fan I could have been really overwhelmed with the task of playing the first female Master… was just that I could say my lines and go.

How does Missy see this version of the Doctor?

Is he more of a friend?

More of an enemy?Its very ambiguous what that dynamic is.

They definitely had different opinions about certain things one was good, one was evil.

It does feel like a friendship thats gone wrong.

Theyre still kind of pleased to see each other.

But they remember why they deleted their memories after 10 minutes in each others company.

Is there anything you wish you would have done on the show as Missy?No.

I have to say, its been such a dream role.

To be standing on the steps of St. Pauls Cathedral was just a phenomenal day.

There was just something magical in that script.

So I feel like Ive ticked most of my wishlist.

Do you have a favorite episode?

Either of something thats aired or coming up?Whats coming up is really exciting.

Theres stuff that I would describe as altogether extremely odd or unnerving even for me.

Lets just say it was a massive acting challenge, that Ive hoped weve managed to pull off.

It just doesnt get any better than that.

Not for a regular old jobbing actor.

What jumped out of the page on that day, I did not see coming.

Whats about to happen is really kind of wrong as well.

Doctor Whoairs Saturdays at 9 p.m.

ET on BBC America.