Blue Peter S2023E20 - Harry Potter, Magic with Stephen Mulhern and a Gold Badge

Joel goes behind the scenes at the Harry Potter and the Cursed Child stage show to learn the secrets behind the magic. Meanwhile, Stephen Mulhern is in the studio to show us some magic of his own, and he goes head-to-head with Joel in a Guinness World Record attempt. And Abby has a very special surprise in store for superstar author Julia Donaldson.