Percy Jackson and the Olympians are the latest heroes to walk out of a book and onto the big screen.
As the first film in the series - Percy Jackson And The Lightning Thief - hits cinemas, we sent Sonali to chat to some of the stars.
Kevin McKidd is Percy's dad Poseidon in the film.
He told Sonali what it was like playing a Greek God, why he let his son read the film script before he accepted the part and why he's a big fan of Newsround...
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