You want people to be shocked when the name comes out. You want people to go, ‘No, that would never work!’ They did that with Matt, when they announced Matt. It was, ‘He’s far too young, and he doesn’t look right. He’s got silly hair.’ You want people to go, ‘Oh, what have they done?’ And they always get wrenched out of their comfort zone, and then they find the Doctor again. And there’s such a range of what the Doctor can be.
‘Doctor Who’ casting: Steven Moffat says, ‘You know it when you see it’ | Hero Complex