It's Always Sunny in Philadelphia star and creator Rob McElhenney (heretofore known as Mac) will be writing and directing his first movie for Legendary.

The actor signed with the production company armed with a 20 minute pitch and a four minute test reel. Mac's film is called Figment and, Deadline reports that "It’s a family action adventure about an imaginative boy and his family who are thrown for a loop when their greatest fears come to life. It is a template for the kind of large scale film that fits the Legendary template, and there is a ticking clock incentive that puts it on a fast track."

This doesn't really come as a surprise. Rob, Charlie Day and Glenn Howerton shot a test reel for their show when they were pitching it to FX after failing at seven other networks. It just makes sense that Legendary would take a leap like this.