Torres del Paine National Park in Chilean Patagonia holds the highest density of pumas anywhere, and this final episode of the series builds around a night-time hunt for them. Wildlife filmmakers Voirin and Evans track the cats on foot and by vehicle, filming them stalking guanacos, feeding, and playing under infrared and low-light cameras once the sun goes down. McGavin leaves the mountains for an island off northern Chile, following a radio-tagged colony of vampire bats to a sea lion rookery, where the cameras catch the bats feeding on sleeping sea lions. Further south, Buchanan works the Magellan Straits at night to film humpback whales coming close to shore, and records a theory that the whales use kelp fronds to brace against strong currents while they rest. The episode moves between these three crews and locations rather than following one story, using thermal and low-light camera work to show behavior, hunting, feeding, sleeping, that would otherwise be invisible after dark.