New discoveries reveal that Mars was once home to alien life, and today, modern-day explorers are trying to transform this desert world into a new Earth-like planet for humans. This is a mashup of "Space's Deepest Secrets", S04E02, "Mission to the Red Planet" and "How the Universe Works", S05E06, "Life and Death on the Red Planet".

New discoveries reveal the secrets of the universe's most unknown and mysterious places. This is a mashup of "Space's Deepest Secrets", S04E03, "Hunt for the Edge of the Universe" and S03E01, "Hunt for the Hidden Cosmos".