Inside the issue - which is available for just £1.99 on your iPad - Olsen says her Scarlet Witch outfit is slightly different to what we've seen in the comics.
"It respects and involves the comic-book character, but it's different, more rooted," she says. "It's for someone today."
As for her favourite part of the costume, she adds: “My favourite piece is the secrecy cloak. There's a hood and a robe – it protects the image!"
Avengers: Age Of Ultron opens in the UK on 1 May 2015.
For more from Olsen, pick up the brand new issue of Total Film , which is out now , and includes an exclusive look at Captain America: The Winter Soldier , 300: Rise Of An Empire , X-Men: Days Of Future Past and Godzilla , plus many more exciting new movies.