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".

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

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.