It stars David Janssen, Barbara Rush, Geoffrey Lewis and Bradford Dillman, with a script by Alvin Sapinsley[1] (based on Leslie H. Whitten's novel of the same name).

In the Louisiana Bayou town of Marsh Island, two farmers (Royal Dano, and John Davis Chandler) discover the mauled, dead body of a local young woman.

The sheriff's investigation soon takes him to the plantation home of the wealthy Andrew Rodanthe (Bradford Dillman) and his sister Louise (Barbara Rush).

While there, the full moon rises again, and Lawrence and the sheriff's deputy are killed in a vicious attack after the steel bars of the cell are torn from the wall.

Andrew and the sheriff return to Hugh Burrifor's house and discover the old man has created a voodoo potion that gives off a vapor meant to repel the Rougarou.

While there, Andrew's sister Louise tells the sheriff she can speak French fluently and would talk to Hugh Burrifor about the unexplainable term Rougarou.

She reveals a family secret, that her grandfather used to suffer from unusual spells of sickness, implying he was a werewolf and Andrew's curse was inherited.