Actor Warwick Davis - AKA Professor Flitwick and Griphook - explores the BBC archives and conjures up the story of the Harry Potter films - a tale that starts with the casting of Daniel Radcliffe, Emma Watson and Rupert Grint, and ends with the trio firmly established as internationally recognised teenage superstars. The programme uses rarely seen footage and interviews to explore behind the scenes, looks at how the franchise became one of the biggest in cinema history and gets the unique perspectives of the series's producer, directors, actors and JK Rowling herself.