Zachary Quinto explores the unpredictable and terrifying phenomenon of sinkholes to determine just what causes them. He visits a Florida man whose brother was killed when their family home was literally swallowed whole by the Earth as well as a series of sinkholes that are forming a series of caves right below the houses of a quaint suburban neighbourhood.
Whether they be a part of some biblical prophecy or further evidence of mankind's effect on our planet, he's alarmed to discover that all the same, they can strike anywhere in the world, at any time.

We all come from the same place, a moment when a dead rock came to life. Discover the story of how and why life began on Earth, and what makes our planet different from the others.

In 1983 Hasbro bought the license of the Diaclone and Micro Change toys from Takara, then commissioned Marvel Comics to come up with a story-line and character names for the toys. The result: Transformers. Despite Tonka releasing the cheaper Gobots line six months earlier, Hasbro's Transformers took the toy market by storm in 1984, raking in US$150 million that year. At the peak of the toy line's popularity, The Transformers: The Movie hit theaters to further capitalize on its success, but the film polarized fans and collectors with the death of Optimus Prime and majority of the original characters. As Hasbro took full control of Transformers from Takara by the late 1980s, sales declined until the toy line was discontinued in 1991. After the failed Generation 2 reboot, Beast Wars rejuvenated the franchise in 1995.
In 2007, the live-action Transformers film solidified Transformers' position as Hasbro's flagship toy line.

Exoplanets, strange worlds outside our solar system. We're discovering the cosmos is full of alien planets. Alien worlds that challenge our understanding of planetary systems. Hellishly hot worlds, violently colliding worlds, worlds getting eaten by their stars. There's much, much more out there than we had ever imagined.
Exoplanets are shaking up our understanding of the universe. The cosmos is a chaotic array of the odd, the weird, and the wonderful. The more we find, the less we know.

The fourth episode sees host Neil deGrasse Tyson exploring our eternal quest to end hunger and honoring Nikolai Ivanovic Vavilov, pioneer of modern plant breeding, who risked his life for a discovery that would change the history of science. Vavilov's story is marked by both the tenacity and creativity and is particularly tragic. Interwoven into Vavilov's somber narrative are warnings and treatments of science and its ethical implications, especially when science itself comes under attack from political forces.

We inhabit a cosmos of undiscovered dimensions and paradoxical realities. We live on one level of perception, but there are others. Every once in a while, a searcher happens upon the doorway to one of these other levels. One of them discovered a paradox about reality that proved to be so profound, we have yet to understand how it could be possible. The universe, or perhaps we should say, universes have never been the same.
In the counterintuitive realm of quantum mechanics, light can be two contradictory things, and somehow - no one knows how - an unseen observer can alter the nature of reality. The man who stumbled on this hole in reality and the still- unfolding technological revolution that it made possible.