Stan Lee on how to create a super-hero

Comic-book legend Stan Lee, the co-creator of Spider-Man and other Marvel characters including the Hulk, The X-Men and Iron Man, has spoken to the BBC about some of his characters.

Lee talked about how to come up with super-heroes but said "I don't know what the formula is".

Lee, who recently celebrated his 89th birthday, is appearing as the headline guest at the London Super Comic Convention 2012.