Starring Stewart Moss and Marianne McAndrew, the film tells the story of a doctor, who after being bitten by a bat in a cave, undergoes an accelerating transformation into a man-bat creature.

Dr. John Beck, recently married, decides to take his wife, Cathy, spelunking in Carlsbad Caverns for their honeymoon.

As he begins to transform, Dr. Beck unwittingly goes on a killing spree, catching the attention of the cruel Sergeant Ward.

Dave Sindelar, on his website Fantastic Movie Musings and Ramblings gave the film a negative review, calling it "forgettable".

[6] VideoHound's Golden Movie Retriever awarded the film one out of four bones, calling it "[a] Less-than-gripping horror flick".

[8] The Terror Trap gave the film 2/4 stars, writing, "this 1974 drive-in horror boasts some beautiful snowy vistas and picturesque desert landscapes.