Inside the issue - which is available for just £1.99 on your iPad - Green reveals that she loved playing badass Artemisia because it didn't require her to reform to the typical girlfriend movie role.
"She's so ballsy," she says. "She's not a girlfriend or a love interest; she's got guts, she's fuelled by revenge.
"She's a very complex character, very exciting. It's always been a fantasy for me to play an action hero. She's a baddie, but she's a cool baddie; she's human to an extent."
300: Rise Of An Empire is in UK cinemas now.
For more from Green, pick up the brand new issue of Total Film, which is out now, and includes an exclusive look at Captain America: The Winter Soldier, Avengers: Age Of Ultron, X-Men: Days Of Future Past and Godzilla, plus many more exciting new movies.
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