Embedded in the streets of more than two dozen U.S. cities and three South American cities, the Toynbee tiles deliver a cryptic command to resurrect the dead on the planet Jupiter. Made from ordinary linoleum and asphalt crack-filling compound, these license-plate-sized plaques have baffled city workers and obsessed urban explorers for decades. This episode decodes how they were made, the philosophy behind their text, and the grassroots investigation that pointed to a single reclusive creator.

We trace the deployment method uncovered by researchers, the link between Arnold J. Toynbee's writings on psychosomatic resurrection and Kubrick's 2001, and the bizarre twist involving playwright David Mamet, who believed the tiles honored his work when the timeline shows the reverse. We follow the trail from the James Morasko alias to prime suspect S ...