After more than 30 years, acclaimed filmmaker Brad Bird is finally bringing his long-awaited passion project, Ray Gunn, to the big screen. The animated sci-fi film follows a human detective in a futuristic world where humans and aliens coexist. Speaking about the project, Bird revealed how the movie was shelved for decades after studios refused to make it, and how he eventually negotiated to reclaim the rights when it remained untouched. Here's why Ray Gunn took over three decades to become a reality.