Isaac Newton spent decades on work he never wanted published: alchemy, biblical numerology, and a private calculation of when the world would end. This BBC documentary tracks the manuscripts that reveal that hidden side of the physicist, including papers where he uses the Book of Daniel to forecast an apocalyptic date and notebooks recording years of alchemical experiments conducted in secret. Historians and Newton scholars examine the original documents, tracing how the man who wrote the Principia and defined the laws of motion also spent his nights over furnaces trying to unlock the philosopher's stone and studying scripture for hidden chronologies. The film argues that these were not eccentric side projects but central to how Newton understood the universe, driven by the same conviction that hidden order lay behind visible phenomena, whether in physics or in prophecy. The result complicates the tidy image of Newton as a purely rational founder of modern science, showing a mind that moved between mathematics, theology, and the occult without treating them as separate pursuits.