Logo text It’s a version of a movie not seen since 1983. It wasn’t even supposed to still exist. But we can definitively tell you that yes, Virginia, there really is a 2.5-plus hour cut of  Gremlins . And, in its first-ever screening, a select few fans, who also happen to be leading the charge of the new generation of horror, got to see it Thursday night. The audience initially had no idea what they were in for. The invite, “to watch a movie no one has ever seen,” was texted to select members of the horror community and was being presented by Verve and Scott Glassgold’s 1201 Films production banner. “You will never forgive yourself,” it read. “It’s an archival screening, in a way,” is what Gremlins ’ legendary director  Joe Dante said, describing the evening and what was about to be shown.…