David Tennant

Unlike other enduring characters such as 'Sherlock Holmes' or 'Tarzan,' being the 'Doctor' allows you a certain freedom that is both very demanding and very thrilling. It allows you to make the character using elements of yourself.

Animation is a fascinating area from an acting point of view because it's not really like anything else because you are only providing a portion of the performance. That's very inspiring and it forces you to do things in a different way - to tell stories through your voice.