Jay learns that, far from being a relic of the Cold War, nuclear Armageddon is as big a threat as ever.

During the COVID-19 pandemic, Jay tackles the existential threat of disease, while considering the added danger of human-made viruses.

Jay believes that aliens are out there, watching us at the very least. But do they pose a threat? (Maybe!)

Jay learns about a surprising threat. Supervolcanoes are often overlooked, but when they erupt, they will change the Earth's climate.

Jay explores the emergency that is climate change, and considers what we can do, as a species, to save ourselves from… ourselves.

A.I. is here. Is it going to take over? Jay finds out how much time remains before society bows down to its robot overlords.

Jay is terrified of outer space. Turns out, he's right to be afraid.

Jay learns about a terrifying, and growing, problem: insects are dying off and it's humanity's fault. What happens if they become extinct?

This tiny technology may help to solve major problems, but Jay learns that it also comes with extraordinary risks to the environment.

Jay explores the idea that reality is actually a computer simulation. But, if nothing is real, then should anyone try to save the world?

Jay confronts the ultimate existential threat: his own doom.

Could an asteroid destroy the world? Jay meets with experts including the Planetary Defense Officer at NASA to find out if "we're all gonna die".