'Harry Potter': What is the secret to the boy wizard's success?

Harry Potter took over Leicester Square this evening as Deathly Hallows: Part 2, the final movie in JK Rowling's wizard saga, held its world premiere.

Since its debut on the big screen in 2001 with Chris Columbus's Harry Potter and the Philosopher's Stone the films have pleased die-hard fans, critics and cinemagoers, pulling in more than $6 billion at the worldwide box office.

This phenomenal achievement begs the question: What is the secret to Harry Potter's success?

Digital Spy attended the world premiere of Harry Potter and the Deathly Hallows: Part 2 to ask stars Rupert Grint, Jason Isaacs, Matthew Lewis, David Thewlis, Imelda Staunton, Miriam Margolyes, James Phelps, Oliver Phelps and director David Yates why Harry Potter has struck a chord with so many people across the globe.



Harry Potter world premiere coverage:
> 'Harry Potter Deathly Hallows: Part 2' world premiere: In Pictures
> 'Harry Potter' fever: Fans flood Trafalgar Square for world premiere
> Rupert Grint: 'Harry Potter' support is crazy
> 'Harry Potter' Weasley twins: 'Voldemort is the definition of evil'
> 'Harry Potter' Matthew Lewis: 'I was terrified filming Voldemort scenes'
> Jason Isaacs: 'Harry Potter Deathly Hallows 2 a triumphant exit'
> Daniel Radcliffe: 'Harry Potter Deathly Hallows 2 is light years ahead
> 'Harry Potter Deathly Hallows: Part 2' - Watch the world premiere
> 'Harry Potter' star David Thewlis: 'Fans don't recognise me'
> 'Harry Potter' Imelda Staunton: 'Films are fantastic'