The Vanishing Shadow COMPLETE S01
https://www.imdb.com/title/tt0025940/
A 12-episode Universal serial in which a son avenges the death of his father at the hands of corrupt politicians. He develops a wide variety of complex devices in his crusade . . . ray guns, robots and a ‘vanishing belt.’ Note: The serial features what is believed to be the first appearance of a hand held ray gun in film.
