The brilliant Harlem Globetrotters bring their world-famous basketball skills to the Blue Peter studio this week - there's an amazing performance, and our presenters have a go too! How to Train Your Dragon author, Cressida Cowell, is live in studio to chat about the Little Picture Challenge and the Dragons finale on CBBC. Also, Barney takes on a 10K running challenge with sports therapist Amy Hughes, who ran a staggering 53 different marathons in 53 days! Show less