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David Tennant agrees that [showrunner Russell T.] Davies made the right choice in casting Harris as the episode's villain. "Oh, he’s good," the actor says. "I don’t quite know if he knew what to expect, but he dived in with such gusto and brio. This part requires a lot of skill sets and Neil turns up with them all. I don’t want to give away too much about what might be required of the Toymaker, but you need a sort of an all-round entertainer to play that part and a very good actor, so there aren’t a lot of people who could have ticked all the boxes required. We were really excited when Neil said 'yes,' and actually it’s impossible to imagine who else it might have been. He’s a sort of theater animal, so he’s got that bit of graft about him that my Scottish Presbyterian soul rather enjoys being around. And he’s got a twinkle in his eye, which is sort of the combination of elements that you need for Doctor Who, I think."