A little girl discovers dreams do come true if you really believe. Six-year-old Susan has doubts about childhood's most enduring miracle - Santa Claus. Her mother told her the "secret" about Santa a long time ago, so Susan doesn't expect to receive the most important gifts on her Christmas list. But after meeting a special department store Santa who's convinced he's the real thing, Susan is given the most precious gift of all - something to believe in.

All the kids in a town over night become feverish and have convulsions. The next day they start to become evil, change their names for those of kids killed long ago, and then start killing any adult in their path, in vicious and mysterious forms. A young woman who has just returned to town tries to find out what is happening, while trying to protect her transformed young sister. However, the kids are starting to revive their leader...