In a post-apocalyptic future, humanity is on the brink of extinction following a devastating nuclear attack. The Earth has been invaded by a strange being that combines features of a gorilla and a space helmet. This individual, known as the "Robot Monster," aims to eradicate what remains of humanity to fulfill its mission of conquering the planet on behalf of an extraterrestrial civilization.
As the monster stalks a small group of survivors who have taken refuge in a cave, the group members, led by a brave man named Roy, desperately seek a way to survive and resist the advances of the fearsome enemy. Through a series of surreal encounters and escalating tensions, stories of love, despair, and the struggle for survival unfold in a devastated world.
As the characters attempt to devise a plan to stop the Robot Monster, their hopes and fears are revealed. The situation becomes even more complicated when echoes of the past civilization intertwine with the present, creating an atmosphere of nostalgia and hopelessness. Amid laughter and tense moments, the film becomes a reflection of humanity's fight against the forces that seek to crush it, while the Robot Monster continues its relentless quest to eliminate any trace of human life. A blend of science fiction and horror that gains cult classic status over time.