After the events of the first movie, the "immatures" go on a trip to the Greek island of Paros.

When a fisherman leaves to fight with the Greek army during World War II, his fiancée falls in love with the local Italian commander.

It is on Ascension Day that Zoe, a brilliant computer analyst, visits the National Park in the center of Athens with her daughter, Katerina. That afternoon in the park, Zoe experiences an overwhelming array of instinctive compulsions and transforms into an ancient Maenad in ecstatic frenzy, even capable of murder. Instincts and animals get loose and panic takes over.