Tom Hiddleston is shocked his Thor character is so popular.

The 32-year-old actor plays character's evil brother Loki in the movie, and admits he didn't expect ''in his wildest dreams'' that his alter-ego would be so well-liked by supporters of the movie.

Speaking to Nuts magazine, Hiddleston said: ''Loki and Thor are like yin and yang, the sun and the moon.

''The immense popularity of the character has been an amazing surprise. I never expected it in my wildest dreams.

''It's fascinating to play the god of mischief. And he's such a broken character - bitter, jealous, grief stricken, angry, lonely and proud.

''The cocktail of his psychological damage and his playfulness makes him really interesting to portray.''

Meanwhile, Chris Hemsworth, who plays Thor, insisted that Loki is such a popular character because Tom puts in such a great performance in the film franchise.

He further pitched in: ''It might not have been the original plan to have Loki come back but Tom brings an incredible mixture of strength, villainy and vulnerability which means you can easily empathise with this misunderstood guy.''