Helen was the hidden main villainess in the 1971 film Werewolves on Wheels.
She was played by Donna Anders (credited as D.J. Anderson).
Helen was the girlfriend of Adam, the leader of a biker gang heading across the desert. During their journey, the group comes across a church that is taken over by a Satanic cult, who drugs the gang and kidnaps Helen. The cult later performed a ritual that results in Helen turning heel and becoming a werewolf at night. While making love to Adam, Helen bites him on the neck, passing the werewolf curse on to him as well.
As the film progresses, each of the bikers are killed by the couple in their lycanthropic state, with the gang unaware of Helen's villainous persona. At the climax of the film, however, the evil Helen transformed into a werewolf, as did Adam, in front of the rest of the gang. Shortly afterwards, Werewolf Helen is burned to death by Tarot.