The Cities episode travels from Los Angeles to Kolkata, highlighting inspiring stories of people reshaping urban life and sharing space with wildlife. Despite 60% of the world's population living in cities, there's hope for urban wildlife. In Los Angeles, a mountain lion unites a community and becomes the unofficial mascot of the city, while in Kolkata, locals clean the urban wetlands, creating incredible wildlife habitat and supporting thousands of jobs. And in futuristic Singapore, reforestation efforts have transformed the city, enhancing life for citizens and attracting wildlife like hornbills.