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. Written by
The Bat People
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.