Chris Pine co-wrote, and will star in, the new comedy Mantivities.

Set up at Waterstone Entertainment, this coming-of-middle age tale will revolve around a group of early thirty-somethings at war with their adolescence. They all come together with the goal of helping one of their friends grow up.

Chris Pine wrote the screenplay with pals Will Greenberg, Drew Howerton, Robert Baker, Ian Gotler, and Tony Liebetrau. It is not known if any of them will also appear in the film.

Michael Patrick Jann is set to direct. No production start date was announced. Chris Pine had this to say about the upcoming project.

"I couldn't be happier to begin the adventure of making Mantivities knowing how much fun we all had writing it. Somehow I get to laugh with my friends and call it work."