Monday, Oct. 4 at 10 p.m. ET/PT

Science may have discovered the key to immortality: an enzyme, called telomerase, which “keeps DNA young.” The irony? It can also kill you. Telomerase is found in cancer cells, and may be one of the reasons cancer is so deadly. Immortal? uncovers the extraordinary discovery made by Australian scientist Elizabeth Blackburn, whose research surrounding telomerase, cancer and stress have revolutionized our understanding of the aging process—and started a very real race for the ultimate anti-aging pill.