Holidaying doctor gets bitten by bat and starts exhibiting nocturnal behaviour.
Dire horror film that only merits a look for early make-up work from Stan Winston.
Yep, it's pretty bad, but the MST3K version (under its alternate title) makes it palatable. Winston's work, when it's finally seen, isn't very impressive (it actually looks more like a howler monkey than a bat anyway). Paul Carr's mustache gets acting honors in this one.