Steven Spielberg‘s mystery movie gets more interesting and exciting with each new revelation. First, there was the detail that the so-called “event film” would be out May 15, 2026. Then there was the tidbit that it’s allegedly going to involve UFOs. And, finally, the numerous casting announcements — featuring the likes of Emily Blunt, Josh O’Connor, and more. Now, thanks to co-writer David Koepp, we now know perhaps the most exciting detail of all: that the film is apparently a completely original idea of Spielberg’s.