Unfinished version of the immortal story with Jason Robards in the lead role, who was replaced by Jack Palance and the resultant film was released one year later as The Strange Case of Dr. Jekyll and Mr. Hyde (1967).
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Henry Jekyll is a troubled man. His wife died of pneumonia. He wants his sister-in-law, but her father forbids any contact. And his experiments into the dual nature of man have yielded a personality-splitting drug that he has tested on himself, changing him into an uninhibited brute who seeks violent and undignified pleasures. Jekyll quickly becomes addicted to the sordid freedom induced by the drug. He can commit the most enjoyably revolting deeds, then return to his laboratory and use an antidote to change back to his original form, so that his lofty persona remains untarnished.
Wisecracking reporter Carl Kolchak investigates a string of murders in Las Vegas and suspects the culprit is a vampire. His editor thinks he's crazy and the police think he's a nuisance, so Kolchak takes matters into his own hands.
A malevolent being known as The Jester terrorizes the inhabitants of a small town on Halloween night, including two estranged sisters who must come together to find a way to defeat this evil entity.