Actor Jason Segel is adding author to his resume after turning an old film script into a new book series for young adults.

The Muppets star reveals he came up with the story when he was 21 and sold the plotline for "super cheap" as an aspiring actor, but he recently tracked down the material and bought back the rights - and he has since decided to rework it into a collection of novels.

He says, "As I got more successful I kept hoping they (film developers) wouldn't realise I was the same Jason Segel as the Jason Segel they bought the script from (before he became famous)."

Segel is keeping the title of the literary project under wraps for the time being and he's not yet ready to open up about the series itself, simply explaining, "It's about kids facing their biggest fears, that's about all I can tell you."

News of the books, which the actor hopes to release later this year (13), was revealed during a special question and answer session on Thursday (04Apr13) after a New York screening of his 2008 film Forgetting Sarah Marshall.