Part 4/11:
The pivotal moment arrives as the group discovers an abandoned building linked to their father. It holds the promise of transition into alternate dimensions, but their exploration is interrupted by a chilling reality—welded graffiti murals describe various Earths, each with distinct historical deviations. Suddenly, disaster strikes as the city outside is revealed to be in ruins, victims of a long-ago nuclear catastrophe. As the danger escalates, the characters face rapid decisions about survival, leading them deeper into the building's enigmatic nature.