Having a long running television series is a tricky beast. Because so often we’ve seen shows get stale at around Season 4 or 5, followed by the failed attempts to recover, and then the series ending disappointingly. The challenge to keep things fresh and organic is surely one that the folks behind Grey’s Anatomy feel, as the ABC medical drama is now halfway through its 13th season. Considering we’ve seen just about every medical miracle and sex scene imaginable, how will Grey’s continue to keep its many viewer entertained? Well, by introducing a new type of character we’re not really familiar with: a bonafide villain.