Reggaeton blares from speakers rigged onto Mexico City's metro cars as gang members work the crowded carriages, part of a subculture that turns the subway system into a moving stage and a hustle at once. The film rides the rails with these crews, capturing impromptu dance performances, vendors working the aisles, and the loose social codes that govern who controls which train and which line. Interviews with gang members and riders lay out how the reggaeton scene grew up alongside the informal economy of the metro, where music, commerce, and territory overlap. The camera stays close to the actual cars and platforms, following the crews as they move between stations, drawing a crowd, then dispersing before transit police arrive. It is a street-level look at a scene most tourists never see, told mostly through the people living it rather than through outside narration.