Marvel Comics; Evan Agostini/Getty Images; Tony Barson/Getty Images
So what exactly attracts an Oscar-nominated actress to comic-book fare? A love of Norse mythology? Beefy blond guys twirling hammers? A potential franchise? Not quite.
"I just thought it sounded like a really weird idea 'cause Kenneth Branagh's directing it," Portman said during the weekend junket for her much more highbrow flick, Brothers.
"And Ken Branagh doing Thor is super weird. I've got to do it."
She's in good company. Portman will star alongside Chris Hemsworth (as the hammer-wielding god of thunder), Anthony Hopkins, Stellan Skarsgård and Stuart Townsend. Filming starts in January for a 2011 release.