Devil Times Five (1974)

Five children (including a young Leif Garrett) survive a deadly van crash in a snowy canyon and seek shelter at the secluded winter home of a rich businessman and his guests. Soon enough, the electricity and telephones go down and the adults begin to fall prey to a series of violent deaths. By the time the few remaining adults suspect the demented delinquents, it may be too late for them to survive this enjoyable cult horror film. Beautiful transfer with alternate main title sequence, trailer, photo gallery, interviews and commentary with actors and crew.  Now out of print.  DVD