Watch: Guardians of the Galaxy Cast Audition For Groot (Exclusive)

In ‘Guardians of the Galaxy’ the gentle arboreal thug Groot, voiced by Vin Diesel, only has one line: “I Am Groot”.

However, every time he says it, it carries a different meaning. Think of him as a (only very slightly) more eloquent Chewbacca.

When we spoke to the cast, we wanted to know if any of the other actors could step in and cover for Vin for the sequel.

We auditioned Chris Pratt, Zoe Saldana, Karen Gillan, Dave Bautista and director James Gunn getting them to read the line.

But, as our exclusive video above proves, Vin Diesel proved to be very canny casting.

Chris Pratt’s take is absolutely priceless.

'Guardians of the Galaxy' is in cinemas now.