He is famed as the god of thunder, but Thor is to change sex, launching an "all-new era" for the comic book icon, its publisher says. Marvel Comics would introduce the female Thor in its latest series in October, it announced, emphasising the new incarnation of Thor was not She-Thor or Thorita, but just Thor. It was not known if the sex change will carry through to the Thor movie series or see its male fans whispering "Phwoar" in appreciation of a muscle-bound new heroine. "The inscription on Thor's hammer reads 'Whosoever holds this hammer, if he be worthy, shall possess the power of Thor'," said Marvel editor Wil Moss. "Well it's time to update that inscription." He added: "The new Thor continues with Marvel's proud tradition of strong female characters like Captain Marvel, Storm, Black Widow and more. And this new Thor isn't a temporary female substitute. She's now the one and only Thor, and she is worthy!" The sex change is not unprecedented for Marvel, which was bought by entertainment giant The Walt Disney Company in 2009. Captain Marvel used to be male, but was now female, a spokesman said. On the big screen Thor has been portrayed by Australian actor Chris Hemsworth in two films as well as 2012's record-breaking The Avengers . He will reprise the role in Avengers: Age of Ultron , due out next year. It is unclear whether the actor will have to hang up his hammer, to be replaced by a female version. "This is a publishing-only initiative," Marvel Entertainment spokesman Joe Taraborrelli said. Disney official Megan Wasserman said: "The announcement ... was about the comics, and as normal Marvel policy we cannot [comment] on film activities, rumours or speculation."