Today, Friday the 13th, is Red Nose Day! You've probably been surrounded by a flurry of red all day long, and it's nearly time for the official show to broadcast on BBC One. Remember, David Tennant is presenting for the first hour alongside Davina McCall and they will both be starring in a special Mastermind. Also, there is a special Sarah Jane Adventures sketch with Ronnie Corbett and the Slitheen. There are rumours there will be a Planet of the Dead teaser, too. Enjoy the night of fun and don't forget to donate to charity, it's for a great cause.