Former Doctor Who star David Tennant was just announced as the villainous Zebediah Killgrave (The Purple Man) in Marvel's Netflix original AKA Jessica Jones. Starring opposite Krysten Ritter, Tennant's Kilgrave is:
An enigmatic figure from Jessica's past, Kilgrave's reappearance will send shockwaves through the former super hero's world... After a tragic ending to her short-lived super hero stint, Jessica Jones is rebuilding her personal life and career as a detective who gets pulled into cases involving people with extraordinary abilities in New York City.
In the comics Kilgrave is a former spy who, after being exposed to experimental chemical weapons, can make any lie believable. With that backstory, we can only hope Tennant has the same power.