If you love Doctor Who, you must also love this character.
The Master has proven to be a reliable constant in the Doctor Who universe, but is The Doctor's meddling Time Lord antithesis pure evil or just misunderstood? Most of the time, villainy is the name of The Master's game, but its done with such jovial abandonment that viewers can't help but see the fun side.
He/she is like a cheating version of The Doctor, breaking all the sacrosanct principals of science and morality to serve his/her own end. Nothing the Master ever does is safe or straightforward. Remember that time when two separate incarnations simultaneously murdered each other, and then laughed about it?
The responsibilities of playing such a character is therefore no mean feat. The Master has taken on many different guises and siphoned through styles a great deal more varied than The Doctor, and that makes for a very eclectic list of personas. Only in Doctor Who, could it be possible that all these actors contibuted to one singular creation.