Oscar-nominated actor Benedict Cumberbatch has inspired a worldwide phenomenon known as “Cumbermania,” but long before his army of fans began to sweep the globe, Cumberbatch was a successful stage actor in the UK. In this week’s “Sunday Sitdown” Willie Geist chats with British actor about his rise to fame, from his on-screen breakthrough in “Sherlock” to his latest, more family-friendly role as “The Grinch,” and the reputation he has built as one of the most sought-after actors in Hollywood.