A tormented father witnesses his young son die when caught in a gang’s crossfire on Christmas Eve. While recovering from a wound that costs him his voice, he makes vengeance his life’s mission and embarks on a punishing training regimen in order to avenge his son’s death.

A scientist, Dr Holander, takes his niece Miranda to Mexico in an attempt to reverse the effects of the alien DNA he used to create her. However the treatment goes horribly wrong, and sets Miranda on a killing spree as she sets out to find a mate.