With the news that Matt Smith is leaving Doctor Who at the end of the year, the internetz are all a-flutter with discussion of who should be the next Doctor. Regeneration is just a part of life for the Doctor, but for those of us on the outside looking in, we get seriously attached to each version. Doctor Who is more popular now than it has ever been, and a lot of that is thanks to how great Matt Smith has been in the role. That means the choice to replace him is more important than ever! We’ve come up with twenty different ideas for who could fill Matt Smith’s boots when he regenerates.