Brent Lang Executive Editor of Film and MediaBefore there was the popular two-part horror film franchise “It,” a 1990 mini-series featuring Tim Curry as the child-eating clown Pennywise scared the bejesus out of a generation of television watchers.“Pennywise: The Story of It,” offers up a behind-the-scenes look at the making of that earlier adaptation of Stephen King’s novel, which has achieve cult classic status over subsequent decades.