Chris Hemsworth is an Iron Man fan

Chris Hemsworth and Robert Downey Jr. Photo / Getty Images

Aussie heart throb Chris Hemsworth says when he's not playing Thor, Robert Downey Jr's Iron Man is his superhero of choice.

Hemsworth, who made it in Hollywood after being cast as Marvel's god of thunder Thor, says Downey Jr has brought a comic touch to a comic book hero.

"It would have to be Iron Man (that I like the most)," Hemsworth told AAP.

"The wit, the humour and the SNAFF (situation normal, all full of fun) that Downey has is unrivalled."

Hemsworth is in Australia in his role as a Foxtel ambassador.

He attended the pay-TV giants 2015 program launch at Sydney Theatre on Thursday while earlier in the week he made several promotional commercials for Foxtel.

"It's great to be home, I haven't spent this amount of time in Australia for a few years now," he said.

His trip Down Under is the first of many he will be making around the world over the next few months when he starts promoting his four upcoming films.

He said country hopping to promote movies can be as mentally and physically taxing as making them.

"Usually you're in each country for about 12 hours and then you're on a plane to the next one," he said.

"It's a whirlwind."

The success of the Marvel franchise on the big screen and Hemsworth's portrayal of Thor means he is inextricably linked to the superhero.

It's a connection he says he will be forever grateful for and, like a victim in a Thor movie, he would never turn his back on it.

"Thor opened up every opportunity in my career and I do love it and I'm a fan of what Marvel are doing," Hemsworth said.

"I saw Guardians Of The Galaxy the other week and it's the most amount of fun I have seen in a movie in years.

"All of us love that style of story telling and to be a part of it and the rabid fan base and following is a dream."

- AAP