After her favorite mare dies while giving birth on her grandfather's farm, Polly's spirits are lifted when she discovers that the foal is a magical baby unicorn. The secret spreads throughout the village, and troublemakers finagle to steal the unicorn for their own gains.

Ethel and Tommy Barrick are sent to Ireland to spend the summer with their new stepmother. Once there, they discover her to be an evil, power-seeking witch, with real magical powers and a hatred for all things green.

After declaring that he's going to film himself committing suicide for a school project, Archie videotapes his surprising interactions with worried family members, interested classmates, unreliable medical experts and the hottest girl in school.