It's the ultimate engineering project: how do you build a planet or a universe? And what happens if you get anything wrong? With stunning CGI, Richard Hammond is about to find out.

Ch1. A Planet
How on earth do you build a planet that is just right for life? What do you need to build a planet like ours, and what happens if you get anything wrong? With eye-popping graphics, Richard Hammond opens up a cosmic toolbox to work it out. He's going to build the whole thing, piece by piece, from the top of a two-mile high tower in the Californian desert.

Ch2. A Universe
How on earth do you make a planet, or a solar system, a galaxy or even a universe? To find out, he opens up his cosmic toolbox and builds each one piece by piece, from the top of an impossibly high tower. What does he need to construct the cosmos, and what happens if he gets it wrong? With eye-popping computer graphics, Richard discovers that it takes an entire universe to make our planet just right for us