“Jack Harkness had been introduced to enormous success and that’s just down to John Barrowman really. He’s a most incredible man and made the most incredible impact. He literally became a sensation overnight. And it was this extraordinary character. We just thought, he’s bigger then just a companion aboard the Tardis in a way, He’s an omnisexual, swaggering lover of a hero and how could I not want to do more with a character like that?”

Russell T. Davies gushing about Jack Harkness and John Barrowman