It's not exactly an interview that's going on [in documentary]. I guess we do ask Edward Snowden some questions and we're recording him answering them and so on like that.

I have been known for almost 30 years to sort of do whatever comes my way. It's always been touch-and-go after each job finishes. I just like to be working.

You have this certain about of responsibility to play a fictitious character and you have a script that's guiding you and the other information of the custom department's choices, and the set department, "Where are you," and all those other pieces of information but you have to cull from your imagination the answer to all the unasked questions. And with a real person, there's someone to get that information from, perhaps.

You can't really gauge the difficulties of television. There's difficulties and joys that happen with an amazing, great team, when one is working. Television can be a very frustrating job for almost anybody working in television, because you're shooting episodically, and you don't know one scene from the next, and maybe they change around.

"I'm going to show you I haven't given you permission because clearly you're not grown up enough to understand that, not having given you permission, you can't just come look in my house." And I won't know if they're coming and looking or not... so I put a piece of tape over it.

That's probably the biggest secret of acting: If the actor believes it themselves, they can make you believe it.

The power of television - it's so present in our lives, we don't even know how powerful it is.