Stark Mad plot
"See and Hear Terrible Adventure in Horrible Jungle of Central America!"
James Rutherford has organized an expedition into the jungles of Central America to find his missing son Bob and his guide Simpson. Professor Dangerfield intercepts the party and brings Simpson with him, whose experiences in the jungle have turned him into a raging maniac. They set foot on land and decide to spend the night in a Mayan temple. After Bob's betrothed Irene disappears, they encounter a large monkey chained to the temple floor. Meanwhile, Captain Rhodes, the commander of the hunt, is kidnapped by a strange monster with large furry claws.