In a world where the boundaries of time are not just crossed but shattered, the brilliant but reclusive physicist Dr. Arthur Quartermain, portrayed by Edward Fox, makes a discovery that will challenge everything humanity knows. With the reluctant aid of his skeptical colleague, played by Eleanor Bron, and under the watchful eye of a mysterious government overseer Peter Jeffrey, Quartermain unlocks a portal to a primordial Earth, a savage landscape teeming with unimaginable dangers. This sci-fi adventure, directed by Bill Hays, plunges the team into a desperate struggle for survival against the elements and ancient creatures, forcing them to confront not only the perils of a forgotten world but the profound consequences of their own ambition. As alliances are tested and the very fabric of reality threatens to unravel, Quartermain must race to prevent a cataclysm that could erase both the past and the future.