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For a show today about our true selves, we begin with a plague.

Exodus chapter 10 verse 13. So Moses stretched out his staff over Egypt,

and the Lord made an east wind blow across the land all that day and all that night.

By morning the wind had brought the locusts.

They covered all the ground until it was black. They devoured all that was left after the haile.

Nothing green was left. No tree. No plant in the field. And all of Egypt.

Locusts. Their reputation for destruction is so epic that they almost don't sound real.

But they are real. A plague of biblical proportions as locusts invade New South Wales in Australia.

There's nothing left for our women and children to eat.

The biggest locust plague in decades. So we're left with nothing once the locusts have been here.

For centuries people had no idea where these creatures came from.

It was a complete mystery. They just seemed to come out of nowhere,

decimate everything and vanish. And then in 1921 scientists finally figured it out.

The source of the horrible locusts, grasshoppers.

Hi, almost smiley. Should I try to catch it?

Yeah. That's Lulu Miller playing with grasshoppers at a lab in the UK,

which is filled to the roof with bright green grasshoppers.

For a long time, no one ever imagined that these smiley, happy things could also be these monstrous

...