"Behind the Mask,"profiles the career of Guy Williams, though very much concentrating on his work with Disney (though it gives a moment's homage to his work on Lost in Space. It is guided by Williams' son, Guy Jr. and his biographer Antoinette Lane, with help from the star's stunt double, Buddy Van Horn and others that had a direct connection with the series. Among other things, we learn that all of the swordplay, which is very much in the style of movies from the 40s and 50s, is performed by Williams, who also contributed some ideas for the character of Don Diego.