It's Alive (1969)

Plot

A secluded farmer captures three individuals and confines them in a dark cave, where they face an unexpected terror: his pet prehistoric creature. As panic ensues, the trio must confront their primal fears and devise a strategy for survival. The tension escalates as the farmer's twisted motivations are revealed, forcing the captives to grapple with their own instincts while attempting to escape the clutches of both their captor and the monstrous beast lurking in the shadows. The film explores themes of isolation, fear, and the consequences of playing god with nature.