Jon Hall is back as The Invisible Man, but not the same one he played in INVISIBLE AGENT . Like all the Invisible Man movies, THE INVISIBLE MAN’S REVENGE features a new protagonist, as Hall plays Robert Griffin, an escaped mental hospital patient who comes to London seeking his share of a diamond mine after being left for dead in the African jungle by partners Sir Jasper and Irene Herrick. Griffin has returned to get what’s coming to him, and he does… Irene dopes him, and the couple throw the rascal out. Disoriented, Griffin stumbles into a nearby river, where he’s saved from drowning by shady Cockney Herbert Higgins.

Higgins and his disreputable attorney pal try to shake down Jasper, but are confronted by the local chief constable. Griffin’s left to fend for himself, when he stumbles upon the home of Dr. Drury, a scientist experimenting with invisibility on animals…