Buffy The Vampire Slayer mastermind Joss Whedon has defended his obsession with creating feisty female heroines - insisting there is a desperate lack of role models for women in Hollywood. The writer/director - who is currently working on the script for the forthcoming Wonder Woman movie - wants to use his talents to inspire America's youth to fight evil and promote peace. He says, "I have to be very careful to avoid becoming an old guy who just has one trick. The fact people still talk about me writing these strong female characters suggests there aren't enough of them around. "It's amazing how many anti-role models there are for young women, so it's important to have these ones."