Devil Times Five (1974) (aka Peopletoys)
Five children crawl from the wreckage of a deadly van accident in a snowy canyon. The juvenile survivors (including teen heartthrob Leif Garrett) seek shelter at a secluded mountaintop winter home occupied by a rich businessman (Gene Evans) and his friends (including Sorrell Booke and Shelly Morrison). Soon, strange mishaps occur and the group is stranded without electricity and telephones. One by one, the adults begin to fell prey to a series of shocking and violent deaths. By the time the few surviving adults suspect the demented delinquents it may be too late.