William Shatner explores the earth and beyond in search of the universe's most fascinating, strange and inexplicable mysteries.

As we make plans to travel beyond the Moon to new worlds, how are we preparing to become human extraterrestrials? Just how will we survive this trip into the unknown?

The blue marble we call Earth remains in large part a mystery to the 8 billion people who live on it. How did Earth come to exist, and what are the secrets of its survival? How long will humans be able to call it home?

For centuries, we've been fascinated by our nearest planetary neighbor, Venus, and its shimmering appearance in our night sky.

From massive asteroids and deadly bursts of radiation to microscopic alien viruses, each one of these cosmic dangers may end human civilization as we know it. Can we prepare for the inevitable calamity?

We humans want to boldly go into uncharted territories to make new discoveries. As the next era of space exploration begins, what will we find when we reach other planets?