Movie in the 70s about a man transforming into a snake

The Utah community of Santa Ynez is being terrorized by a mysterious black coupe that appears out of nowhere and begins running people down. After the car kills off the town sheriff, Captain Wade Parent is determined to stop the murderous driver.

When faced with incriminating information, Bridget is forced to take action and intervene when her best friend (Ana) attempts to seek revenge on her ex-girlfriend.

Harry and Valerie Spalding arrive in the remote Cornish village to an unwelcoming and suspicious population. Harry's brother dies suddenly, bitten by a lethal reptilian bite. They befriend a young woman Anna whose tyrannical father controls her life and, as they discover that others in the village have suffered a similar fate, their investigations lead to Anna. What they uncover is a victim of the most terrifying legacy... a destiny of mutilation and murder.

Filmed at the Piff the Magic Dragon Theatre at the Flamingo Casino and on location in and around Las Vegas, this is Piff's debut hour starring Mr Piffles, Jade Simone, Francis the Squire and Penn Jillette as Pop the Magic Dragon.