After being bitten by a bat in a cave, a doctor undergoes an accelerating transformation into a man-bat, which ruins his vacation and causes considerable distress for his wife.

A doctor specializing in bats, and his new wife interrupt their honeymoon to go spelunking in Carlsbad Cavern. There he is bitten by a fruit bat and inexplicably undergoes a transformation into a vampire bat. He ultimately escapes, however, escaping back to the caves. His wife, infected by her husband, kills the local constabulary and goes to join him.—<[email protected]>

Dr Stewart Moss and his new wife Cathy decide to go cave exploring on their honeymoon. While visiting Dr. Moss is attacked and bitten by a vampire bat, which results in him transforming into a half-man half-bat creature and he begins going on a killing spree, attracting the unwanted attention of the mean-spirited Sheriff, who has eyes for Cathy—charmardee-smith