Scooby-Doo and the Mystery, Inc. gang head to Mexico for a much-needed vacation, but their relaxation is disrupted by El Chupacabra, a legendary monster that is stalking the village.
Lucas, a moody rebel who grew up on the poor side of town, and Nathan, a privileged preppy, meet when they attend the same high schol and discover they have the same dad.
Teenager Holly Hamilton creates an imaginary secret admirer for her mom in order to distract her from her latest relationship and keep her from wanting to pick up and move again.