Comic book superhero Thor has had a sex change - Marvel bosses have recreated the character as a woman. The Marvel masterminds hope that by recasting Thor they will encourage more women and girls to read comics. Thor debuted as a time-travelling Norse god in 1962, and recently hit the big screen as part of Marvel's run of successful comic book superheroes. He is portrayed onscreen by Australian hunk Chris Hemsworth. The new female Thor will debut in her first adventure in October (14). Buffy The Vampire Slayer creator and The Avengers director Joss Whedon already has an actress in mind should the female Thor grace the big screen. He took to Twitter.com and posted a photo of Battlestar Gallactica and 24 action star Katee Sackhoff, along with the caption, "A female Thor? What the hell makes them think THAT would be cool?"