With an estimated 50 to 70 million feral cats living in the United States, overpopulation and unchecked fertility has reached epidemic proportions. Left ignored, that number is expected to quickly reach 100 million. In Los Angeles alone, there are more than 3 million homeless cats on the streets. This episode goes inside a nondescript building in the San Fernando Valley in California where a team of highly-specialized veterinarians are pushing back, doing the most spay-neuters of feral cats anywhere in the country. Relying on a dedicated volunteer army of cat trappers spreading out across the city's back alleys, warehouses and industrial landscapes, this story highlights the unsung heroes that are trying to do something positive about this little-known crisis.