It's The Nerdist Tribute to Sci-Fi. We'll hear from horror master Guillermo del Toro - the nicest man in Hollywood. Also joining Chris and the gang will be the angelic Katee Sackhoff, star of Battlestar Galactica and 24. We'll find out what fictional world they'd like to dwell in and then we'll put their knowledge of British programming to the test in the television trivia game BBC(een) It! Also, Matt Smith sends one of his battalion of mechanical clones to talk more about life as the Doctor.