In the year 3000, man is no match for the Psychlo's, a greedy, manipulative race of aliens on a quest for ultimate profit. Led by the seductive and powerful Terl, the Psychlo's are stripping Earth clean of its natural resources, using the broken remnants of humanity as slaves. What is left of the human race has descended into a near primitive state, believing the invaders to be demons and technology to be evil. After humanity has all but given up any hope of freeing themselves from alien oppression, a young man named Tyler decides to leave his desolate home high in the Rocky Mountains to discover the truth, whereupon he is captured and enslaved. It is then that he decides to fight back, leading his fellow man in one final struggle for freedom.

A family descends into a vortex of denial and paranoia after the death of the oldest son. Though labeled a suicide, the bizarre circumstances lead the mother, Helen, to believe there are darker forces at work. Black paint was thrown over everything reflective in the son's decrepit Victorian house, an explosive trap set in his bedroom and a woman from his past haunts the cemetery where he lies buried. But when Helen's investigation threatens to ruin the life of her teenage daughter, Kate, and possibly her own sanity, she realizes there is but one escape from this nightmare world - the very route attempted by her dead son. Finale captures mystery, horror and suspense in the colorful visual style of the 1970's Italian gialli.