Main Characters Narrator 19 main appearances Dr. Sascha Auerbach, Historian 3 main appearances Dr. Michele Mitchell, Historian 2 main appearances Dr. Greg Szulgit, Biomedical Scientist 2 main appearances Rob Bell, Engineer & Adventurer 1 main appearances Jim Meigs, Author & Journalist 1 main appearances Corina Kwami, Infrastructure Advisor 1 main appearances