Sent as a gift to the Doctor from River Song (a.k.a.

Hes been with the doctor for many, many years.

Hes had a life in space with River Song before he met the Doctor.

DW-S10_EP11_3

Credit: Simon Ridgway/BBC America

So hes been to a lot of the places before and met a lot of the other characters.

For instance, hes had experience with Daleks before.

Hes less tolerant towards the Doctor, in some regards.

So the doctor might hold a little bit less mystique for him.

However, he also is subservient to the Doctor because hes pretty much the doctors valet.

He wants to challenge him but at the same time, he knows he cant push it too far.

Weve been learning Nardoles history in bits and pieces over the season.

Hes a hybrid of android, alien, and human, as far as I can tell.

So I was slightly aghast at the prospect, but I also thought that was rather wonderful.

Also, I was impressed that he knows where the teacakes are in the TARDIS.

I didnt know what was in the vault until I actually asked.

Nobody told me, and then one day I went, Whats in the vault?

and Peter [Capaldi] told me.

I thought, Thats clever.

If I talk to nobody about it, then I just dont have to worry.

The less I knew, the better because its hard to keep secrets.

People get upset because they go, Well, it’s possible for you to trustme.

But I never tell anyone anything.

Theyre called spoilers for a reason.

I try and be really respectful of the fact that its not my show.

Its not my gift to divulge information.

Often wed be talking and saying, Well, ah, thats interesting.

I thought it was very different.

Was that the case with this last episode where you were trying to figure out the science of it?

Because the ship has two different time zones within it.Yeah.

I find those things really hard to understand.

Is she really good at the science of it?I just think shes cleverer than I am.

Speaking of Pearl, we know that Bill has kind of been turned into a Cyberman now.

Theres so much stuff that gets cut.

He was very vulnerable [starting with episode] Oxygen onwards really.

Where we left off, the Master and Missy are teaming up.

How is Nardole reacting to that?He is pretty fearful of them, and for good reason.

Do you think Missy can turn good?

The doctors placed his faith in that.

Nardole probably trusts them a little less than the Doctor.

I loved episode 1 as well.

Bills introduction was done beautifully.

Probably my personal favorite is Oxygen actually because it just felt like a really classic space adventure.

I loved the idea of capitalism in space and the way it explored the idea.

It was really good.

It wouldnt be fair of me to do that.

But its been a great experience the three of us working together.

Thats thanks to the writing and also the direction and the other actors.

I havent played just one character for that length of time before.

So its been great.

TheDoctor Whoseason finale airs Saturday at 9 p.m.

ET on BBC America.