Experts are discovering new Earth-like planets all over our universe, and using the latest science, they investigate the secrets of these strange worlds that could be homes for extraterrestrial life. This is a mashup of "Space's Deepest Secrets", S03E04, "Search for Alien Earths" and S04E04, "Journey to Alien Earths".

New technology helps experts make startling discoveries about the origins of the universe's stars, revealing the secrets of how they transformed the cosmos. This is a mashup of "How the Universe Works", S01E04, "Extreme Stars" and "Space's Deepest Secrets", S01E08, "Quest for the First Star".