If you thought that dinosaurs were the most dangerous things in the Jurassic, think again. There was actually something way worse and far more deadly.

In this episode, Steve goes on a mission to uncover what was deadlier than the dinosaurs - from massive monsoons and supersized sandstorms to ballistic bacteria and gory gas.

And in an epic finale, Steve ends with a bang as he recreates the dinosaur-killing asteroid impact in an experiment that's second to none.