There is a new book out by Billie Rae Bates to mark the 50th anniversary of the TV show.
Let's Roll, Kato: A Guide to TV's Green Hornet (BRBTV Fact Book Series 6)
"The ABC series lasted only one TV season, 1966-67, but a wealth of information still exists on it. Now, in a new book released just as the show turns 50, author and journalist Billie Rae Bates chronicles it all, from the planning of the series in the mid-'60s, as shepherded by character co-creator George W. Trendle and executive producer William Dozier, through each and every episode, to the fandom beyond. Bates talked with the series' title star and other members of the cast and crew, as well as writers and other industry professionals who have been involved with the show's lore over the decades."