This peculiarly nasty combination of horror flick and biker movie concerns a brutal trio of Hells Angels from the San Francisco Bay area who attend a drunken birthday party for one of their "old ladies" in the Redwood Forest. Intruding on the orgiastic occasion are what appear to be genuine devils from hell, bloodthirsty revenants from the 1950s, who are even worse than the bikers. It's one of those movies that belongs in an incinerator rather than a cinema.