Alien Planets Revealed Preview

Preview: Season 41 Episode 1 | 30s

Are we alone—and if not, what might the inhabitants of far-flung worlds look like?

Aired: 01/08/14

Rating: TV-G

The full episode is no longer available for online streaming. Why?

Please continue to enjoy extra(s) from this episode. The full episode is still available for purchase through the "Buy Now" links.

Problems Playing Video?