Ryan Reynolds voicing world's fastest snail in Turbo

And he won't appear in Justice League

Ryan Reynolds is set to voice the lead character in upcoming DreamWorks animation, Turbo.

The film follows a garden snail who dreams of becoming the world's fastest, and gets the opportunity after a freak accident.

David Soren, who previously directed festive spin-off Merry Madagascar, will call the shots, having co-written the script with Darren Lemke (Shrek Forever After).

Reynolds has previous form with DreamWorks animation, as he's already signed to voice a character in Chris Sanders' caveman comedy, The Croods.

The Croods also stars Nicolas Cage and Emma Stone, and will be released in March 2013, a few months ahead of Turbo.

In related news, Reynolds has told the LA Times that he isn't going to appear as the Green Lantern in the upcoming Justice League movie, saying: "That's a whole business model and nothing to do with me at all.

"No one has ever approached me about doing a Justice League movie. We’ll see if they do it in the long run."

This announcement adds further weight to the idea that Warners' JLA will be a standalone movie, unlike Marvel's The Avengers, which unites heroes set up in standalone movies.

Reckon Turbo sounds like a better gig for Ryan than Justice League? Comment now!