Kevin McKidd of "Grey's Anatomy" fame was happy to return to his roots with Disney-Pixar's new animated film, "Brave," which is set in the Scottish kingdom of DunBroch.

In the movie, the 38-year-old actor and native of Scotland plays two characters - Lord MacGuffin and his son, Young MacGuffin. The lord and two others, Craig Ferguson's character, Lord Macintosh, and Robbie Coltrane's Lord Dingwall, present their boys to compete for the hand of Princess Merida, the film's heroine, played by Kelly MacDonald. Billy Connolly plays her father, King Fergus.

McKidd disguises his Scottish accent when he plays former US Army trauma surgeon Dr. Owen Hunt on "Grey's Anatomy," ABC's it medical drama series.

"In 'Grey's, I have to be American, I have to be quite controlled. Owen Hunt's a tortured guy and he's very serious a character," McKidd told OnTheRedCarpet.com, while talking about "Brave." "It's nice to be kind of wild and zany and Scottish for a while."

In the animated film, the male characters wear traditional kilts. In one scene, Lord Dingwall moons Lord MacGuffin and others by lifting his up in front of them, yelling: "Feast your eyes!"

"They just kind of said, 'Now he's gonna show his [butt] to you,'" McKidd said. "And I was like, 'What?' That was a lot of fun. The shame is none of us got to really hang out together, you know, Craig [Ferguson] and Billy Connolly. We're all doing separate sessions. I would have loved to have been doing all that together."

McKidd says he owns two kilts in real life and that he was taught to dance traditional Scottish dances when he was a child.

"We were taught that in PE, physical education, in Scottish school," he said. "Every boy and girl [is] taught those dances for kind of like a month and a half, at Christmas time, when it's so cold you can't go outside. You're in the gym hall and you get taught all those dances. So it's like riding a bicycle for me."

"It's so much fun, I can't tell you how much fun that dancing is for me," he added. "It's such a social thing. It breaks down so many barriers. I'm very proud of my heritage."

McKidd began his on-screen career in the 1990s. He and Macdonald both starred in the 1996 movie "Trainspotting," which deals with the drug scene in Edinburgh. The film helped launch the Hollywood career of main star and fellow Scotland native Ewan McGregor.

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Kevin McKidd talks 'Brave,' 'mooning' scene, Scotland & 'Grey's Anatomy' future (Video)