Chris Hemsworth admits he was initially intimidated on the set of 'Ghostbusters'.

The 32-year-old actor plays receptionist Kevin in the remake of the 1980s classic and says working alongside the four main female stars - Melissa McCarthy, Kristin Wiig, Kate McKinnon and Leslie Jones - was nerve-wracking because they're all comedians.

He said: ''It was initially (intimidating), then it was just hard trying not to laugh. I just kept cracking up.''

Chris also admitted he wasn't used to the work of director Paul Feig, who likes to use a lot of improvisation.

He told News Shopper: ''I was really nervous. I kept getting told 'the scenes are coming, we've got to rewrite some scenes' because there wasn't much of my character in the script. There just wasn't much of a character. I got to Boston the night before I'm shooting and I'm like, 'I've still not got the script, what am I doing?' I said to [Feig] 'I've still not got the script, what do I do for you tomorrow?' He said 'Don't worry, we'll work it out'.

''Everyone kept saying that's his method and you get on set and he just keeps the camera rolling and the girls start improvising, he'll yell suggestions and you keep going, you crack up, you try and hold together. And it is endless reels of chaos. But it is so much fun.''

However, he soon found himself enjoying that style of work.

He revealed: ''It is quite liberating. If it didn't work, it was like 'well it's not my fault, you didn't give me a script.'

''There was something quite refreshing about that rather than being given the world's greatest script and going 'Don't mess it up'. It was nice to do that. That improvisation created such a spontaneity and organic feel.''