7. Benedict Cumberbatch
Talk about the girlish "SQUEE!" heard round the world. If I had a nickel for the amount of times I've listened to people say they wanted this man in the lead role, I'd be rich. Once they announced Capaldi and all of those SQUEE'ers wept, they shifted their hopes and dreams onto him playing the Master instead. And while it's wildly impractical, no one can deny that he'd make a damn fine bad guy, let alone one of pop culture's greatest villains ever. Considering how popular Moffat's other series, Sherlock, is, fans have been clamoring for a crossover. And while the idea of Sherlock and the Doctor teaming up to solve a case is so incredible it could end the world, it's very unlikely. One exists in reality and the other exists in...all the rest of it. Though, if Cumberbatch could clear a few weeks on his schedule, it's not impossible to think he could play the Master. And boy could he play it. Though some had issue with (spoilers) the re-hashing of the Khan storyline in J.J. Abrams' second Star Trek, it's undeniable what a hauntingly moving and villainous character he's capable of portraying. Transpose that onto a timelord who despises his counterpart and feels betrayed by his people and you've got a recipe for a great Master.