The upcoming movie Peter Rabbit is based on the beloved classic by Beatrix Potter, and combines live actors with animated bunnies for a storybook showdown. It's Peter and his siblings versus the menacing Mr. Thomas McGregor.

Evening's Jim Dever sat down with the cast to talk about the movie -- but the Late Late Show host with the titular role, James Corden, put shifted the focus to be on Jim's gravelly voice.

"Stop trying to get off topic here," James insisted. "How can I concentrate when your voice is cutting through me?"

The dynamic voice of Mopsy is supplied by Guardians of the Galaxy Vol. 2's Elizabeth Debicki. To get into her role, she says she had to really think and talk like a rabbit.

"I naturally have a lower voice," Elizabeth remarked. "So, I had to really pitch it up."

The movie's humans, Rose Byrne and Domhnall Gleeson had their own voice challenges. They hail from Australia and Ireland respectively, and had to shift their accents to play English characters.

For the untrained American ear, Domhnall revealed the one main difference between his native Irish and an English accent: "The Irish sound better."

The two also sounded a bit jealous of their rabbit costars as their characters are not computer generated. Never having to appear on camera, James Corden never had to leave the comfort of his Los Angeles studio.

"Not one day, [James] didn't fly down [to Australia]," Rose revealed.

In the end, Peter Rabbit gives voice to courage, romance and to a classic storybook tale.

Travel and accommodations provided by Columbia Pictures.

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