Since his first role as an ultra-geeky sci-fi buff in Galaxy Quest, aimiable actor Justin Long has appeared in hits including Jeepers Creepers, Dodgeball, Accepted and The Break-Up. In the US he's also known for portraying what a Mac would be like, if it were a person.

Now he's returned to his roots, playing an ultra-geeky computer buff in Die Hard 4.0. BBC Movies Tae Mawson asked him all about it.

  WATCH: Justin Long chat about playing Bruce Willis' sidekick.