According to the Internet Movie Database, there are three people named Fred Calvert. One is the composer for the theme from "Nanny and the Professor," another is a producer, who just happens to have done two cartoons spinoffs of N&TP, as well as "The Mini-Munsters" and "Emergency +4." a third wrote an independent movie back in 1996 called "Rule of Three." I believe that they may be the same person. Anybody have any evidence that two or all of them are?