Mercury is a deadly world, facing attacks from the Sun, comets, and other planets; even though it's the smallest planet in the solar system, Mercury has a dangerous secret that may one day threaten life on Earth.
Guest Cast
Cast Appearances
Mike Rowe
voices Himself (Narrator)
Episode Discussion
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Again retitled, this episode re-aired on 10/22/2018 at 23:00 as "Journey to Mercury: The Dark Secrets" with a summary of "New space missions investigate the smallest and most dangerous planet in the solar system, Mercury."
Retitled, this episode re-aired on 9/24/2018 as "Mercury: the Alien Secrets" with a summary of "New discoveries reveal Mercury's alien mysteries, and experts investigate if the tiny hellish world could threaten life on Earth."