Grant voices the Pirate Captain in the Aardman Animations film and he recently revealed how he found a connection with his bearded swashbuckler character.
"It is a strange process. They do film you as well, just in case you do something funny with your gestures – I don't think I ever did," the actor said, reports Flicks and Bits.
"Unlike a lot of animation, Aardman don't model the character around you, they don't create a Hugh Grant-ish type of Pirate. This character was already 100% created and I had to model myself to him, so that was a bit of a struggle."
Grant added: "I always found it useful if I had a model of Pirate Captain there, particularly with his eyes, because whatever else an Aardman character is, they've always got a sort of innocence, a wide-eyed innocence. I found that a key."
The actor went on to reveal that developing Pirate Captain's distinctive voice was very much trial-and-error.
"I was a little bit nervous about the voice. I thought I was timing the jokes right, but I kept thinking whether the voice was basso enough to go with this great big Pirate Captain," he explained.
"So we worked on that a bit. Then watching the stuff, in a way it's soothing because they're so clever with their animation, so much of the humour is in visual stuff, that the pressure felt slightly off me – it doesn't all completely depend on whether I land the line or not. That was helpful."
The Pirates! In An Adventure With Scientists opens on March 28 in the UK and on April 27 in the US.
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Watch a trailer for The Pirates! In An Adventure With Scientists below: